build: No need to rely on grep for simple glob pattern.

configure

@@ -109,6 +109,7 @@ generate_stdout()
 	echo "           VERSION = $VERSION"
 	echo "         BUILD_DIR = $P_PWD"
 	echo "           SRC_DIR = $BUILD_DIR"
+	echo "            SYSTEM = $SYSTEM"
 	echo "           PROFILE = $PROFILE"
 	echo "                CC = $CC"
 	echo "          COMPILER = $COMPILER"
@@ -249,7 +250,7 @@ fi
 
 DCORES=2
 printf "Detecting operating system......."
-SYSTEM=`uname -s 2> /dev/null | grep "^[A-Za-z0-9]*" -o`
+SYSTEM=`uname -s 2> /dev/null`
 case "$SYSTEM" in
 	"SunOS")
 		SYSTEM=solaris
@@ -278,7 +279,7 @@ case "$SYSTEM" in
 		DCORES=`sysctl -n hw.ncpu`
 		SYSTEM=darwin
 		;;
-	"MINGW32")
+	MINGW32*)
 		DCORES=2
 		SYSTEM=mingw32
 		LDFLAGS="-mthreads $LDFLAGS"