Remove dead warning

src/hb-unicode.cc

diff --git a/src/hb-unicode.cc b/src/hb-unicode.cc
index ed99ca2..84e5c06 100644
--- a/src/hb-unicode.cc
+++ b/src/hb-unicode.cc
@@ -146,8 +146,13 @@
 }
 
 #if !defined(HB_NO_UNICODE_FUNCS) && defined(HB_UNICODE_FUNCS_NIL)
-#pragma message("Could not find any Unicode functions implementation, you have to provide your own.")
-#pragma message("To suppress this warnings, define HB_NO_UNICODE_FUNCS.")
+#ifdef _MSC_VER
+#pragma message("Could not find any Unicode functions implementation, you have to provide your own")
+#pragma message("To suppress this warnings, define HB_NO_UNICODE_FUNCS")
+#else
+#warning "Could not find any Unicode functions implementation, you have to provide your own"
+#warning "To suppress this warning, define HB_NO_UNICODE_FUNCS"
+#endif
 #endif
 
 /**