Disable Graphite for Android and iOS

It definitely does not make sense for iOS, I assume. For Android the situation
is unclear, but let's disable it for now. It causes linking errors currently
anyway as the graphite_serverfont.cxx is not compiled for Android. (Whether it
could and should be compiled then instead of disabling Graphite, I don't
know.)

Change-Id: I1a874d304af508d2217da08e49dc158664f2e9d2

configure.ac

@@ -8373,7 +8373,7 @@ dnl Graphite
 dnl ===================================================================
 
 AC_MSG_CHECKING([whether to enable graphite support])
-if test "$_os" != "Darwin" && test "$enable_graphite" = "" -o "$enable_graphite" != "no"; then
+if test $_os != Darwin -a $_os != Android -a $_os != iOS -a \( -z "$enable_graphite" -o "$enable_graphite" != no \); then
     AC_MSG_RESULT([yes])
     ENABLE_GRAPHITE="TRUE"
     AC_DEFINE(ENABLE_GRAPHITE)