Revert "helado: add qmake files for platform of Win32 only."

This reverts commit 3cce2f127e2e18343af82808f9bf5bf34ede3705.
Revert "helado: remove config of 'HD_TARGET_PLATFORM_UNIX_X86' and 'HD_TARGET_PLATFORM_WIN32_X86'."

This reverts commit f34a3e1626d3270dab43b898fac6e2f32d1f94da.
Revert "helodo: remove '-Wall -Werror' to fix compiling error on platform of"

This reverts commit d10ba823d4c81614b9268daec6abe1a68c6af271.
helado: fix missing error of 'config.h'.
helado: remove '-Wall' for platform of Win32.