fix build with VS2013, strtold now also found in stdlib.h for C++11 conformance
fix Issue 12719 - struct.c:705: virtual void StructDeclaration::semantic(Scope*): Assertion `parent && parent == sc->parent' failed.
Merge pull request #3541 from rainers/fix_VS2013

fix build with VS2013
Merge pull request #3544 from 9rnsr/fix12719

Issue 12719 - struct.c:705: virtual void StructDeclaration::semantic(Scope*): Assertion `parent && parent == sc->parent' failed.