Remove configure checks for few sys/ headers

sys/ipc.h, sys/sem.h, sys/shm.h, and sys/msg.h are actually wrappers
for kernel headers in libc if available, here strace is trying to match
traced process's APIs to syscalls kernel structures

Removing the checks makes it default to right kernel UAPI headers under linux/

Upstream-Status: Submitted [https://lists.strace.io/pipermail/strace-devel/2019-November/009222.html]
Suggested-by: Rich Felker <dalias@aerifal.cx>
Signed-off-by: Khem Raj <raj.khem@gmail.com>
--- a/configure.ac
+++ b/configure.ac
@@ -439,11 +439,7 @@ AC_CHECK_HEADERS(m4_normalize([
 	sys/conf.h
 	sys/eventfd.h
 	sys/fanotify.h
-	sys/ipc.h
-	sys/msg.h
 	sys/quota.h
-	sys/sem.h
-	sys/shm.h
 	sys/signalfd.h
 	sys/xattr.h
 	ustat.h