Add getrandom.c from musl

libs/libglibc-compatibility/CMakeLists.txt

@@ -18,7 +18,8 @@ musl/syscall_ret.c
 musl/sched_cpucount.c
 musl/glob.c
 musl/exp2f.c
-musl/pwritev.c)
+musl/pwritev.c
+musl/getrandom.c)
 
 if (MAKE_STATIC_LIBRARIES)
     set (GLIBC_COMPATIBILITY_SOURCES ${GLIBC_COMPATIBILITY_SOURCES}

libs/libglibc-compatibility/musl/getrandom.c

+#include <unistd.h>
+#include <syscall.h>
+#include "syscall.h"
+
+
+ssize_t getrandom(void *buf, size_t buflen, unsigned flags)
+{
+    /// There was cancellable syscall (syscall_cp), but I don't care too.
+	return syscall(SYS_getrandom, buf, buflen, flags);
+}