all: use baremetal build tag

This simplifies adding more baremetal targets, like a GameBoy Advance,
or baremetal x86 for unikernels.

src/machine/i2c.go

@@ -1,4 +1,4 @@
-// +build !stm32f4disco,!hifive1b
+// +build avr nrf sam stm32,!stm32f4disco
 
 package machine
 

src/machine/machine_generic.go

@@ -1,4 +1,4 @@
-// +build !avr,!nrf,!sam,!sifive,!stm32
+// +build !baremetal
 
 package machine
 

src/machine/spi.go

@@ -1,4 +1,4 @@
-// +build !stm32f407,!avr,!hifive1b
+// +build nrf sam stm32,!stm32f407
 
 package machine
 

src/os/file_other.go

@@ -1,4 +1,4 @@
-// +build avr cortexm tinygo.riscv wasm
+// +build baremetal wasm
 
 package os
 

src/os/file_unix.go

@@ -1,4 +1,4 @@
-// +build darwin linux,!avr,!cortexm,!tinygo.riscv
+// +build darwin linux,!baremetal
 
 package os
 

src/runtime/arch_arm.go

@@ -1,4 +1,4 @@
-// +build arm,!avr,!cortexm,!tinygo.riscv
+// +build arm,!baremetal
 
 package runtime
 

src/runtime/baremetal.go

@@ -1,4 +1,4 @@
-// +build avr cortexm tinygo.riscv
+// +build baremetal
 
 package runtime
 

src/runtime/gc_globals_conservative.go

@@ -1,5 +1,5 @@
 // +build gc.conservative
-// +build cortexm tinygo.riscv
+// +build baremetal
 
 package runtime
 

src/runtime/gc_globals_precise.go

@@ -1,5 +1,5 @@
 // +build gc.conservative
-// +build !cortexm,!tinygo.riscv
+// +build !baremetal
 
 package runtime
 

src/runtime/gc_stack_portable.go

@@ -1,5 +1,5 @@
 // +build gc.conservative
-// +build !cortexm,!tinygo.riscv
+// +build !baremetal
 
 package runtime
 

src/runtime/gc_stack_raw.go

@@ -1,5 +1,5 @@
 // +build gc.conservative
-// +build cortexm tinygo.riscv
+// +build baremetal
 
 package runtime
 

src/runtime/runtime_unix.go

@@ -1,4 +1,4 @@
-// +build darwin linux,!avr,!cortexm,!tinygo.riscv
+// +build darwin linux,!baremetal
 
 package runtime
 

src/syscall/syscall_baremetal.go

@@ -1,4 +1,4 @@
-// +build avr cortexm
+// +build baremetal
 
 package syscall
 

src/syscall/tables_baremetal.go

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build avr cortexm
+// +build baremetal
 
 package syscall