Fix Windows build: add ts_runtime/src to include path for unicode headers

The vendored ICU-subset headers use "unicode/umachine.h" includes.
Adding src/ to CFLAGS lets the compiler resolve these on Windows
where no system ICU is available.

Author: DeusData

internal/cbm/cbm.go

@@ -1,7 +1,7 @@
 package cbm
 
 /*
-#cgo CFLAGS: -std=c11 -D_DEFAULT_SOURCE -O2 -Wall -Ivendored/ts_runtime/include
+#cgo CFLAGS: -std=c11 -D_DEFAULT_SOURCE -O2 -Wall -Ivendored/ts_runtime/include -Ivendored/ts_runtime/src
 #include "cbm.h"
 #include "helpers.h"
 #include "lang_specs.h"