Revert to original working spinlock patch from commit 937fb10

This reverts the patch to the exact state that was working before,
removing the problematic --disable-thread-safety flag that was
causing 'unknown type name slock_t' compilation errors.

Co-Authored-By: Dan Lynch <pyramation@gmail.com>

Author: devin-ai-integration[bot]

versions/13/patches/emscripten_disable_spinlocks.patch

@@ -21,4 +21,4 @@
 +endif
  	echo "#undef PG_INT128_TYPE" >> ./src/postgres/include/pg_config.h
  	# Support gcc earlier than 4.6.0 without reconfiguring
- 	echo "#undef HAVE__STATIC_ASSERT" >> ./src/postgres/include/pg_config.h
+ 	echo "#undef HAVE__STATIC_ASSERT" >> ./src/postgres/include/pg_config.h