OpenGroup specification was updated regarding the return value for
pthread_once, which after Issue 7 states that "the [EINVAL] error for an
uninitialized pthread_once_t object is removed; this condition results
in undefined behavior".
Squashed commit of the following:
libs/libxx: Fix some confusing in naming. If the directory is called libxx, then the library must be libxx.a (unless perhaps LIBCXX is selected).
libs/: Fix paths in moved library directories.
libs: Brute force move of libc, libnx, and libxx to libs. Cannot yet build it in that configuration.
Gustavo Henrique Nihei