Revert unneeded part of "[NFC][Testing] Test Poppler with optimizations" (#24661)

Reverts part of #24628

Author: kripken

test/third_party/poppler/goo/GooLikely.h

@@ -11,9 +11,7 @@
 #ifndef GOOLIKELY_H
 #define GOOLIKELY_H
 
-// XXX EMSCRIPTEN: Remove gcc-specific detection of __builtin_expect.
-// #if defined(__GNUC__) && (__GNUC__ > 2) && defined(__OPTIMIZE__)
-#ifdef __EMSCRIPTEN__
+#if defined(__GNUC__) && (__GNUC__ > 2) && defined(__OPTIMIZE__)
 # define likely(x)      __builtin_expect((x), 1)
 # define unlikely(x)    __builtin_expect((x), 0)
 #else