Beta Branch update inc/php_configure.inc for PHP_LTO, GCC 7 & 8 compatibility

update inc/php_configure.inc for PHP_LTO, GCC 7 & 8 compatibility

- laying down some prep work for GCC 7 & 8 support in PHP compilations along with addressing PHP LTO based compile support
- add optional GCC 8 compiler support via DEVTOOLSETEIGHT='y' for PHP compiles with PHP_PGO='y'. Disabled by default as currently PHP seems to fail to compile some of PHP extensions with GCC 8
- add optional GCC 8 & GCC 7.2.1+ compiler support via DEVTOOLSETSEVEN='y' for PHP compiles when PHP_LTO='y' enabled. Disabled by default though depending on cpus might have performance regressions - especially with PHP_LTO='y' enabled so test and decide for yourself if you want to enable
- rework PHP_LTO='y' for Link Time Optimization (LTO) of PHP compilations which in theory can produce faster PHP binaries but takes 2-4x times longer to compile and uses 2-4x times cpu and memory. But reality is PHP_LTO='y' has tested to be slower for PHP so only adding the routines to support LTO but is disabled by default and auto disabled if PHP_LTO='y' is set when there is less than 16 cpu threads and less than 31000 MB of memory is detected

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123.09beta01 branch

• Branch: https://github.com/centminmod/centminmod/tree/123.09beta01
• Commit History: https://github.com/centminmod/centminmod/commits/123.09beta01