This should have been in quotes - orevent OS/2 build warning

configure.in

@@ -1101,7 +1101,7 @@ case "$target" in
     GFXWIN_DLL='\"gfx_$(MOZ_GFX_TOOLKIT)$(DLL_SUFFIX)\"'
     MOZ_ENABLE_POSTSCRIPT=
     RC=rc.exe
-    RCFLAGS=-n -x2
+    RCFLAGS='-n -x2'
 
     # EMX/GCC build
     if test "$GNU_CC"; then