m4/pcre2_visibility.m4: make sure PCRE2_EXPORT is always safe #413
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Since a8a875e (windows: integrate visibility attributes without conflicts (PCRE2Project#249), 2023-05-16), PCRE2_EXPORT was meant to be defined as an empty value for compilers that don't support -fvisibility in *NIX, but a branch was left uncovered by mistake resulting in compilation issues with propietary compilers in at least Solaris and AIX. define PCRE2_EXPORT even if the compiler is not GCC compatible.
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FTBFS with at least xlc or Sun Studio compilers
Fixes: #392