Remove __SIGRTMIN and __SIGRTMAX from musl include wrappers

The signals between __SIGRTMIN and SIGRTMIN are reserved for use
by musl.  Any references to __SIGRTMIN are likely intended to
be compatible with bionic's internal signals and will cause collisions
with musl's internal signals.

Bug: 190084016
Test: m USE_HOST_MUSL=true host-native -k
Change-Id: Iaa4f66a2b67c0cc1ccf5cff67dc5143e7a433dbb
1 file changed