Remove unused function: jv_mem_invalidate, jv_mem_uninit_setup (#2636)

src/jv_alloc.c

@@ -165,15 +165,3 @@ void* jv_mem_realloc(void* p, size_t sz) {
   }
   return p;
 }
-
-#ifndef NDEBUG
-volatile char jv_mem_uninitialised;
-__attribute__((constructor)) void jv_mem_uninit_setup(){
-  // ignore warning that this reads uninitialized memory - that's the point!
-#ifndef __clang_analyzer__
-  char* p = malloc(1);
-  jv_mem_uninitialised = *p;
-  free(p);
-#endif
-}
-#endif