Check for genrb when checking for icu

git-svn-id: https://svn.apache.org/repos/asf/xerces/c/trunk@408959 13f79535-47bb-0310-9956-ffa450edef68

m4/xerces_icu_prefix.m4

@@ -22,8 +22,8 @@ AC_DEFUN([XERCES_ICU_PREFIX],
 		xerces_cv_icu_prefix=
 		if test x"$with_icu" != x"no"; then
 			search_list="$with_icu /usr/local /usr"
-			for i in $search_list; do
-				if test -r "$i/include/unicode/ucnv.h"; then
+			for i in $search_list; do			
+				if test -x $i/bin/genrb -a -r $i/include/unicode/ucnv.h; then
 					xerces_cv_icu_prefix=$i
 					break
 				fi