make Makefile.PL more dynamic

[duffee]

instead of the hard coded $CC = 'g++ -fpermissive -O';
use the OPTIMIZE key and the CCFLAGS => "$Config::Config{ccflags} -fpermissive"

This might remove the necessity of setting the CC key and remove the config_vars call.

[duffee]

using the same C compiler may fix the problems with undefined symbols when trying to use the .so files which are the FAILs in 1.4_091

see https://stackoverflow.com/questions/78349286/whats-the-general-approach-to-debug-the-undefined-symbol-and-potential-cause