Use malloc_usable_size() on any OS based on GNU libc

malloc_usable_size() is a GNU extension in GNU libc; hence, use it
every time GNU libc is used, rather than only on Linux.

Author: pinotree

qjs.c

@@ -34,7 +34,7 @@
 #include <time.h>
 #if defined(__APPLE__)
 #include <malloc/malloc.h>
-#elif defined(__linux__)
+#elif defined(__linux__) || defined(__GLIBC__)
 #include <malloc.h>
 #elif defined(__FreeBSD__)
 #include <malloc_np.h>
@@ -151,7 +151,7 @@ static size_t js_trace_malloc_usable_size(const void *ptr)
     return _msize((void *)ptr);
 #elif defined(EMSCRIPTEN)
     return 0;
-#elif defined(__linux__)
+#elif defined(__linux__) || defined(__GLIBC__)
     return malloc_usable_size((void *)ptr);
 #else
     /* change this to `return 0;` if compilation fails */

quickjs.c

@@ -34,7 +34,7 @@
 #include <math.h>
 #if defined(__APPLE__)
 #include <malloc/malloc.h>
-#elif defined(__linux__)
+#elif defined(__linux__) || defined(__GLIBC__)
 #include <malloc.h>
 #elif defined(__FreeBSD__)
 #include <malloc_np.h>
@@ -1708,7 +1708,7 @@ static size_t js_def_malloc_usable_size(const void *ptr)
     return _msize((void *)ptr);
 #elif defined(EMSCRIPTEN)
     return 0;
-#elif defined(__linux__)
+#elif defined(__linux__) || defined(__GLIBC__)
     return malloc_usable_size((void *)ptr);
 #else
     /* change this to `return 0;` if compilation fails */