8250605: Linux x86_32 builds fail after JDK-8249821

Reviewed-by: erikj, prr

make/modules/java.desktop/lib/Awt2dLibraries.gmk

@@ -561,7 +561,7 @@ $(eval $(call SetupJdkLibrary, BUILD_LIBFONTMANAGER, \
     CFLAGS_windows = -DCC_NOEX, \
     EXTRA_HEADER_DIRS := $(LIBFONTMANAGER_EXTRA_HEADER_DIRS), \
     WARNINGS_AS_ERRORS_xlc := false, \
-    DISABLED_WARNINGS_gcc := sign-compare unused-function, \
+    DISABLED_WARNINGS_gcc := sign-compare unused-function int-to-pointer-cast, \
     DISABLED_WARNINGS_clang := sign-compare, \
     DISABLED_WARNINGS_microsoft := 4018 4146 4244 4996, \
     LDFLAGS := $(subst -Xlinker -z -Xlinker defs,, \