Move error checking flags to linux only

... as ag/37938010 shows pre-existing issues with the emulator
on mac and windows builds.

Originally added in #98.

Author: jmacnak

build_variables.bzl

@@ -3,22 +3,23 @@ Common build configuration definitions.
 """
 GFXSTREAM_COMMON_COPTS = [
     "-Wall",
-    "-Werror",
     "-Wextra",
     "-Wformat",
+    "-Wshadow",
+    "-Wunused-result",
     "-Wno-missing-field-initializers",
     "-Wno-return-type-c-linkage",
     "-Wno-unused-function",
     "-Wno-unused-parameter",
     "-Wno-unused-private-field",
     "-Wno-unused-variable",
-    "-Wshadow",
-    "-Wunused-result",
+    "-Wno-thread-safety-analysis",
+    "-Wno-thread-safety-attributes",
 ] + select({
-    "//conditions:default": [
-        "-Wno-thread-safety-analysis",
-        "-Wno-thread-safety-attributes",
+    "@platforms//os:linux": [
+        "-Werror",
     ],
+    "//conditions:default": [],
 })
 GFXSTREAM_HOST_COPTS = GFXSTREAM_COMMON_COPTS + [
 ] + select({