Add a "fork" of musl as //fusl.

fusl/src/thread/pthread_cond_init.c

Index: fusl/src/thread/pthread_cond_init.c
diff --git a/fusl/src/thread/pthread_cond_init.c b/fusl/src/thread/pthread_cond_init.c
new file mode 100644
index 0000000000000000000000000000000000000000..8c484ddcded2a10acb6bc9ce4e8dcaf43eb24e39
--- /dev/null
+++ b/fusl/src/thread/pthread_cond_init.c
@@ -0,0 +1,11 @@
+#include "pthread_impl.h"
+
+int pthread_cond_init(pthread_cond_t *restrict c, const pthread_condattr_t *restrict a)
+{
+	*c = (pthread_cond_t){0};
+	if (a) {
+		c->_c_clock = a->__attr & 0x7fffffff;
+		if (a->__attr>>31) c->_c_shared = (void *)-1;
+	}
+	return 0;
+}