Fix windows build

The windows toolchain doesn't support color, only apply
-fdiagnostics-color to HOST and TARGET, not HOST_CROSS.

Change-Id: I17b999a2852b8d70b2d39a58befa10e2e32c4608
diff --git a/core/config.mk b/core/config.mk
index 697f91a..0a01f41 100644
--- a/core/config.mk
+++ b/core/config.mk
@@ -122,7 +122,10 @@
 
 # Force gcc to always output color diagnostics.  Ninja will strip the ANSI
 # color codes if it is not running in a terminal.
-COMMON_GLOBAL_CFLAGS += -fdiagnostics-color
+# Use host and target GLOBAL_CFLAGS so it doesn't apply to HOST_CROSS, the windows
+# toolchain is still 4.8 and doesn't support color.
+HOST_GLOBAL_CFLAGS += -fdiagnostics-color
+TARGET_GLOBAL_CFLAGS += -fdiagnostics-color
 
 COMMON_GLOBAL_CPPFLAGS:= -Wsign-promo
 COMMON_RELEASE_CPPFLAGS:=