e6658cc79a
GCC <cstdlib> does 'using ::strtold;' which requires strtold declared in global namespace. relibc declares it correctly in stdlib.h, but Qt's include chain (qchar.h → qglobal.h → ... → cstdlib) pulls in cstdlib before stdlib.h is fully processed. Adding -include stdlib.h ensures the C stdlib declarations are in scope before any C++ header.