[preprocessor]: Unreachable blocks still processed for some macros

[diamante0018]

#define TEST

#ifndef TEST
#error How did this happen
#endif

main()
{
}

Expected behaviour:

#error block should not be processed at all even though it's technically unsupported because ifndef TEST should never trigger because we defined TEST two lines before.

This is the case for C++ compilers

Unexpected behaviour:

.\gsc-tool.exe -m comp -g iw5 -s pc .\a.gsc
GSC Tool 1.4.3.297-prod created by xensik
[ERROR]:preprocessor:./a.gsc:4:2: #error directive not supported at ./a.gsc

[diamante0018]

This still works on C++

[xensik]

skip logic is parsing directives to find the #endif, or #elif. i will add skip checks to unimplemented directives