libc: Stub out qsort()

libs/libc/include/stdlib.h

@@ -74,6 +74,8 @@ extern "C"
     /* Returns the absolute value of an integer. */
     long long llabs(long long val);
 
+    void qsort(void*, size_t, size_t, int (*)(const void*, const void*)); // Not implemented.
+
 #ifdef __cplusplus
 }
 #endif

libs/libc/src/stdlib.cpp

@@ -78,4 +78,9 @@ extern "C"
     {
         return __builtin_llabs(val);
     }
+
+    void qsort(void*, size_t, size_t, int (*)(const void*, const void*))
+    {
+        NOT_IMPLEMENTED("qsort");
+    }
 }