mxmount: Allow "=" in variable values

mxmount/mxmount

@@ -221,7 +221,7 @@ sub parse_variables {
    my ($key, $value);
 
    foreach(@lines) {
-        if(($key, $value) = /^(\S+)=\s*(.*)$/) {
+        if(($key, $value) = /^(\S+?)=\s*(.*)$/) {
             $V{$key} = $value;
         } else {
             push @invalid,expand_variables($_);