	Required for cross compilation linux -> MinGW32.

diff -ur icu-50.1.orig/source/tools/toolutil/pkg_genc.c icu-50.1/source/tools/toolutil/pkg_genc.c
--- icu-50.1.orig/source/tools/toolutil/pkg_genc.c	2012-11-05 18:14:58.000000000 +0100
+++ icu-50.1/source/tools/toolutil/pkg_genc.c	2012-11-06 18:10:50.000000000 +0100
@@ -54,6 +54,7 @@
 /*
  * The following is needed by MinGW64
  */
+#undef  __USER_LABEL_PREFIX__ /* Disables MinGW64, but required for MinGW32 cross compilation. */
 #ifndef __USER_LABEL_PREFIX__
 #define __USER_LABEL_PREFIX__ _
 #endif
