Fix detection of msys

Author: Luigi96

make/autoconf/build-aux/config.guess

@@ -56,7 +56,7 @@ fi
 # Test and fix cygwin/msys CPUs
 echo $OUT | grep -e "-pc-cygwin" > /dev/null 2> /dev/null
 if test $? != 0; then
-  echo $OUT | grep -e "-pc-mingw" > /dev/null 2> /dev/null
+  echo $OUT | grep -e "-pc-msys" > /dev/null 2> /dev/null
 fi
 if test $? = 0; then
   case `echo $PROCESSOR_IDENTIFIER | cut -f1 -d' '` in