[perl #76674] Locale::Maketext: speed and efficiency tweaks

[perl #76674] Locale::Maketext: speed and efficiency tweaks

Check string to compile for chars ~][ and return \"$string" if not found.
This is a 250% speed improvement on strings which don't require compile and only a
~2% hit if they did need compiling.

Remove \G since everything is being captured it has no value. This means we don't
have to worry about seting pos $string_to_compile = 0 to prevent the previous
regex from affecting this one. There is a negligible speed improvement removing
the \G