Since clang 16 (and gcc 11) the default C++ standard is now gnu++17.
Because audio/festival's build infrastructure does not explicitly set
its C++ standard, this leads to an error:
regexp.cc:178:22: error: ISO C++17 does not allow 'register' storage class specifier [-Wregister]
STATIC char *regnext(register char *p);
^~~~~~~~~
To work around the error, add USE_CXXSTD=gnu++11 to compile for C++11
with GNU extensions instead. While here, pet portlint a little.
PR: 272014
Approved by: fernape
MFH: 2023Q2
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