GNUmakefile: add spellfix target, use it. (#4387)

TODO: Remove the go.mod/go.sum in internal/tools once doing so doesn't break CI (e.g. once we drop support for go 1.19)

* builder/cc1as.h: fix typo found by 'make spell'
* GNUmakefile: remove exception for inbetween, fix instance now found by 'make spell'
* GNUmakefile: remove exception for programmmer, fix instance now found by 'make spell'
* go.mod: use updated misspell. GNUmakefile: add spellfix target, use it.
* ignore directories properly when invoking spellchecker.
* make spell: give internal/tools its own go.mod, as misspell requires newer go
* make lint: depend on tools and run the installed revive
(which was perhaps implied by the change that added revive to internal/tools,
but not required in GNUmakefile until we gave internal/tools its own temporary go.mod)
* .github: now that 'make spell' works well, run it from CI
* GNUmakefile: make spell now aborts if it finds misspelt words, so what it finds doesn't get lost in CI logs
* GNUmakefile: tools: avoid -C option on go generate to make test-llvm15-go119 circleci job happy, see
https://cs.opensource.google/go/go/+/2af48cbb7d85e5fdc635e75b99f949010c607786
* internal/tools/go.mod: fix format of go version to leave out patchlevel, else go complains.

src/runtime/gc_stack_portable.go

@@ -26,7 +26,7 @@ type stackChainObject struct {
 //
 // Therefore, we only need to scan the system stack.
 // It is relatively easy to scan the system stack while we're on it: we can
-// simply read __stack_pointer and __global_base and scan the area inbetween.
+// simply read __stack_pointer and __global_base and scan the area in between.
 // Unfortunately, it's hard to get the system stack pointer while we're on a
 // goroutine stack. But when we're on a goroutine stack, the system stack is in
 // the scheduler which means there shouldn't be anything on the system stack

src/runtime/interrupt/interrupt_avr.go

@@ -27,7 +27,7 @@ func Disable() (state State) {
 // Restore restores interrupts to what they were before. Give the previous state
 // returned by Disable as a parameter. If interrupts were disabled before
 // calling Disable, this will not re-enable interrupts, allowing for nested
-// cricital sections.
+// critical sections.
 func Restore(state State) {
 	// SREG is at I/O address 0x3f.
 	device.AsmFull("out 0x3f, {state}", map[string]interface{}{

src/runtime/interrupt/interrupt_cortexm.go

@@ -46,7 +46,7 @@ func Disable() (state State) {
 // Restore restores interrupts to what they were before. Give the previous state
 // returned by Disable as a parameter. If interrupts were disabled before
 // calling Disable, this will not re-enable interrupts, allowing for nested
-// cricital sections.
+// critical sections.
 func Restore(state State) {
 	arm.EnableInterrupts(uintptr(state))
 }

src/runtime/interrupt/interrupt_gameboyadvance.go

@@ -92,7 +92,7 @@ func Disable() (state State) {
 // Restore restores interrupts to what they were before. Give the previous state
 // returned by Disable as a parameter. If interrupts were disabled before
 // calling Disable, this will not re-enable interrupts, allowing for nested
-// cricital sections.
+// critical sections.
 func Restore(state State) {
 	// Restore interrupts to the previous state.
 	gba.INTERRUPT.PAUSE.Set(uint16(state))

src/runtime/interrupt/interrupt_none.go

@@ -21,7 +21,7 @@ func Disable() (state State) {
 // Restore restores interrupts to what they were before. Give the previous state
 // returned by Disable as a parameter. If interrupts were disabled before
 // calling Disable, this will not re-enable interrupts, allowing for nested
-// cricital sections.
+// critical sections.
 func Restore(state State) {}
 
 // In returns whether the system is currently in an interrupt.

src/runtime/interrupt/interrupt_tinygoriscv.go

@@ -23,7 +23,7 @@ func Disable() (state State) {
 // Restore restores interrupts to what they were before. Give the previous state
 // returned by Disable as a parameter. If interrupts were disabled before
 // calling Disable, this will not re-enable interrupts, allowing for nested
-// cricital sections.
+// critical sections.
 func Restore(state State) {
 	riscv.EnableInterrupts(uintptr(state))
 }

src/runtime/interrupt/interrupt_xtensa.go

@@ -23,7 +23,7 @@ func Disable() (state State) {
 // Restore restores interrupts to what they were before. Give the previous state
 // returned by Disable as a parameter. If interrupts were disabled before
 // calling Disable, this will not re-enable interrupts, allowing for nested
-// cricital sections.
+// critical sections.
 func Restore(state State) {
 	device.AsmFull("wsr {state}, PS", map[string]interface{}{
 		"state": state,