fix malloc realloc cross-compilation issue

* it breaks down with undefined rpl_malloc and rpl_realloc
* github.com/Qucs/ADMS/issue/3
fix MinGW compiler id

* it shows the compiler when the help -h is called
distribute the correct config.h
remove generated admsXml/.adms.implicit.xml
add files to gitignore
move hardcoded CMake config.h

* TODO let CMake configure the config.h header
make install and test on CI instance