Bug 237157 - sysutils/fusefs-pod: fix build with GCC-based architectures

[pkubaj]

Summary

Switch to GCC from ports on GCC architectures to fix linking and include strings.h in src/fusepod_util.h to find strcasecmp:
/usr/local/lib/libtag.so: undefined reference to `std::__cxx11::basic_string<wchar_t, std::char_traits<wchar_t>, std::allocator<wchar_t> >::find_last_not_of(wchar_t const*, unsigned long, unsigned long) const@GLIBCXX_3.4.21'

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=237157