#262 latest mingw-w64-headers break qt5

[ralph engels]

Seems the latest mingw-w64-headers have changed the definition for usage of localtime_r and other reentrant types breaking QT5 builds. I now get localtime_r was not declared in this scope when trying to build QT.
Adding -D_POSIX no longer works either since the guard has changed as well so its now #if defined(_POSIX_C_SOURCE) && !defined(_POSIX_THREAD_SAFE_FUNCTIONS)

I can fix this by adding #include <pthread_unistd.h> just before the _POSIX_THREAD_SAFE_FUNCTIONS guard below the above but im not sure this is the right approach.

[ralph engels]

better fix, by adding -D_POSIX_C_SOURCE to qmakespec like so BIGOBJ_FLAGS="-D_POSIX_C_SOURCE -Wa,-mbig-obj" it also builds.

[ralph engels]

another bug turned up in the latest git version. lrotl and lrotr defined in psdk_inc/intrin_impl.h collides with the same define in stdlib.h. i also filed a bug report to the mingw-w64 team.

[ralph engels]

Also the latest mariadb breaks building qt, exports are missing stdcall suffixes in the latest version which 32 bit qt cannot link to.

[David Macek]

Closing. Hopefully this is fixed by now. If not, new tickets can be filed at GitHub.