Make redbean StoreAsset() work better

- Better UBSAN error messages
- POSIX Advisory Locks polyfills
- Move redbean manual to /.help.txt
- System call memory safety in ASAN mode
- Character classification now does UNICODE

libc/testlib/testlib.mk

@@ -165,6 +165,7 @@ LIBC_TESTMAIN_DIRECTDEPS =					\
 	LIBC_CALLS						\
 	LIBC_INTRIN						\
 	LIBC_LOG						\
+	LIBC_MEM						\
 	LIBC_NEXGEN32E						\
 	LIBC_RUNTIME						\
 	LIBC_STDIO						\