fix getlib.sh's curl/wget detection

git-svn-id: http://svn.freeswitch.org/svn/freeswitch/trunk@12175 d0543943-73ff-0310-b7d9-9358b9ac24b2

build/getlib.sh.in

@@ -5,10 +5,10 @@ ZCAT=@ZCAT@
 WGET=@WGET@
 CURL=@CURL@
 
-if [ -f $WGET ] ; then
+if [ -f "$WGET" ] ; then
     DOWNLOAD_CMD=$WGET
 else
-    if [ -f $CURL ] ; then
+    if [ -f "$CURL" ] ; then
         DOWNLOAD_CMD="$CURL -O"
     fi
 fi