musl does not define some macros so define them ourselves

Signed-off-by: Dirk Neukirchen <dirkneukirchen@web.de>

This commit will fix compile warning as below

tmp/.config-package.in:22096:warning: multi-line strings not supported

Signed-off-by: Shuoyao Wang <wong.syrone@gmail.com>

Signed-off-by: Dmitry V. Zimin <pfzim@mail.ru>