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regex: Set error if compile or match flags are invalid

Evangelos Ribeiro Tzaras requested to merge devrtz/glib:regex-set-error-on-invalid-flags into main

This avoids segfaults in applications when they try dereferencing the passed in GError to learn more about why regex compilation failed.

For example consider the following pattern:

re = g_regex_new (..., &error); if (!re) g_warning ("Error compiling regex: %s", err->message);

Caused a segfault in phosh World/Phosh/phosh#843 (closed) which used the (now) deprecated G_REGEX_JAVASCRIPT_COMPAT

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