tint.h: Remove 'libspirv.hpp' include

This does not belong in the public header - the spirv writer public header does not depend on it.

Change-Id: Id1b2107c3a2003632e1868c2d6a337ddbb0c8b48
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/122382
Reviewed-by: James Price <jrprice@google.com>
Kokoro: Kokoro <noreply+kokoro@google.com>
Commit-Queue: Ben Clayton <bclayton@google.com>
Auto-Submit: Ben Clayton <bclayton@google.com>

include/tint/tint.h

@@ -48,7 +48,6 @@
 #endif  // TINT_BUILD_WGSL_READER
 
 #if TINT_BUILD_SPV_WRITER
-#include "spirv-tools/libspirv.hpp"
 #include "src/tint/writer/spirv/generator.h"
 #endif  // TINT_BUILD_SPV_WRITER
 

src/tint/cmd/BUILD.gn

@@ -21,7 +21,10 @@ source_set("tint_cmd_helper") {
     "helper.h",
   ]
 
-  deps = [ "${tint_root_dir}/src/tint:libtint" ]
+  deps = [
+    "${tint_root_dir}/src/tint:libtint",
+    "${tint_spirv_tools_dir}/:spvtools_headers",
+  ]
 }
 
 executable("tint") {

src/tint/cmd/helper.cc

@@ -18,6 +18,10 @@
 #include <utility>
 #include <vector>
 
+#if TINT_BUILD_SPV_WRITER
+#include "spirv-tools/libspirv.hpp"
+#endif
+
 namespace tint::cmd {
 namespace {