Keyword register has been deprecated in C++ 11 and removed in C++17

[dereckson]

The keyword register was used as a hint for the compiler the variables can be inlined, but apparently, most implementations simply ignored it.

This fixes the following compilation issue with LLVM/clang 16:

strutil.cc:110:3: error: ISO C++17 does not allow 'register' storage class specifier [-Wregister] register int x, y; ^~~~~

References:

• https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2014/n4193.html#809
• https://en.cppreference.com/w/cpp/keyword/register

[sni]

thanks, much appreciated.