Don't symlink macOS framework if not building it

If we are not building macOS targets then the framework has not been
created and we not should go ahead with creating symlinks in it. Check
whether the framework directory is there, if it's not then don't attempt
to create symlinks.

create-openssl-framework.sh

@@ -149,6 +149,9 @@ for SYS in ${ALL_SYSTEMS[@]}; do
     if [[ $SYS == "MacOSX" ]]; then
         SYSDIR="$FWROOT/$SYS"
         FWDIR="$SYSDIR/$FWNAME.framework"
+        if [[ ! -e "$FWDIR" ]]; then
+            continue
+        fi
         cd $FWDIR
 
         mkdir "Versions"