wasm: add support for GOOS=wasip1

This adds true GOOS=wasip1 support in addition to our existing
-target=wasi support. The old support for WASI isn't removed, but should
be treated as deprecated and will likely be removed eventually to reduce
the test burden.

src/syscall/errno_other.go

@@ -1,4 +1,4 @@
-//go:build !wasi && !darwin
+//go:build !wasi && !wasip1 && !darwin
 
 package syscall
 

src/syscall/file_emulated.go

@@ -1,4 +1,4 @@
-//go:build baremetal || wasm
+//go:build baremetal || (wasm && !wasip1)
 
 // This file emulates some file-related functions that are only available
 // under a real operating system.

src/syscall/file_hosted.go

@@ -1,4 +1,4 @@
-//go:build !baremetal && !wasm
+//go:build !(baremetal || (wasm && !wasip1))
 
 // This file assumes there is a libc available that runs on a real operating
 // system.

src/syscall/proc_emulated.go

@@ -1,4 +1,4 @@
-//go:build baremetal || wasi || wasm
+//go:build baremetal || tinygo.wasm
 
 // This file emulates some process-related functions that are only available
 // under a real operating system.

src/syscall/proc_hosted.go

@@ -1,4 +1,4 @@
-//go:build !baremetal && !wasi && !wasm
+//go:build !baremetal && !tinygo.wasm
 
 // This file assumes there is a libc available that runs on a real operating
 // system.

src/syscall/syscall_libc.go

@@ -1,4 +1,4 @@
-//go:build darwin || nintendoswitch || wasi
+//go:build darwin || nintendoswitch || wasi || wasip1
 
 package syscall
 

src/syscall/syscall_libc_wasi.go

@@ -1,4 +1,4 @@
-//go:build wasi
+//go:build wasi || wasip1
 
 package syscall