cmake: Don't check for -static-libgcc/libstdc++ on MinGW.
cmake: Don't check for -static-libgcc/libstdc++ on MinGW.

Definitely supported by GCC 4.6 and later.

trtt/apitrace,surround-io/apitrace,joshua5201/apitrace,joshua5201/apitrace,EoD/apitrace,EoD/apitrace,trtt/apitrace,apitrace/apitrace,joshua5201/apitrace,swq0553/apitrace,apitrace/apitrace,schulmar/apitrace,tuanthng/apitrace,tuanthng/apitrace,schulmar/apitrace,swq0553/apitrace,surround-io/apitrace,swq0553/apitrace,joshua5201/apitrace,surround-io/apitrace,surround-io/apitrace,trtt/apitrace,apitrace/apitrace,EoD/apitrace,tuanthng/apitrace,EoD/apitrace,schulmar/apitrace,schulmar/apitrace,trtt/apitrace,tuanthng/apitrace,trtt/apitrace,apitrace/apitrace,surround-io/apitrace,tuanthng/apitrace,swq0553/apitrace,joshua5201/apitrace,schulmar/apitrace,swq0553/apitrace,EoD/apitrace