std add getrandom to solato solaris based systems

Author: devnexen

lib/std/c/solaris.zig

@@ -16,6 +16,7 @@ pub extern "c" fn getdents(fd: c_int, buf_ptr: [*]u8, nbytes: usize) usize;
 pub extern "c" fn sigaltstack(ss: ?*stack_t, old_ss: ?*stack_t) c_int;
 pub extern "c" fn pipe2(fds: *[2]fd_t, flags: u32) c_int;
 pub extern "c" fn arc4random_buf(buf: [*]u8, len: usize) void;
+pub extern "c" fn getrandom(buf_ptr: [*]u8, buf_len: usize, flags: c_uint) isize;
 pub extern "c" fn posix_memalign(memptr: *?*anyopaque, alignment: usize, size: usize) c_int;
 pub extern "c" fn sysconf(sc: c_int) i64;
 pub extern "c" fn signalfd(fd: fd_t, mask: *const sigset_t, flags: u32) c_int;