Kernel/LibC: Implement sigsuspend

userspace/libraries/LibC/include/sys/syscall.h

@@ -90,6 +90,7 @@ __BEGIN_DECLS
 	O(SYS_SIGACTION,		sigaction)		\
 	O(SYS_SIGPENDING,		sigpending)		\
 	O(SYS_SIGPROCMASK,		sigprocmask)	\
+	O(SYS_SIGSUSPEND,		sigsuspend)		\
 	O(SYS_SETITIMER,		setitimer)		\
 	O(SYS_POSIX_OPENPT,		posix_openpt)	\
 	O(SYS_PTSNAME,			ptsname)		\

userspace/libraries/LibC/signal.cpp

@@ -164,3 +164,8 @@ int sigrelse(int sig)
 	(void)sigaddset(&set, sig);
 	return sigprocmask(SIG_UNBLOCK, &set, nullptr);
 }
+
+int sigsuspend(const sigset_t* sigmask)
+{
+	return syscall(SYS_SIGSUSPEND, sigmask);
+}