Remove declaration of emscripten_force_num_logical_cores (#22722)

The function itself was removed back in #10166

Author: sbc100

system/include/emscripten/threading.h

@@ -29,13 +29,6 @@ int emscripten_has_threading_support(void);
 // Returns the number of logical cores on the system.
 int emscripten_num_logical_cores(void);
 
-// Configures the number of logical cores on the system. This can be called at
-// startup to specify the number of cores emscripten_num_logical_cores()
-// reports. The Emscripten system itself does not use this value internally
-// anywhere, it is just a hint to help developers have a single access point
-// 'emscripten_num_logical_cores()' to query the number of cores in the system.
-void emscripten_force_num_logical_cores(int cores);
-
 // If the given memory address contains value val, puts the calling thread to
 // sleep waiting for that address to be notified.
 // Returns -EINVAL if addr is null.

system/lib/pthread/library_pthread_stub.c

@@ -21,10 +21,6 @@ int emscripten_has_threading_support() { return 0; }
 
 int emscripten_num_logical_cores() { return 1; }
 
-void emscripten_force_num_logical_cores(int cores) {
-  // no-op, in singlethreaded builds we will always report exactly one core.
-}
-
 int emscripten_futex_wait(
   volatile void /*uint32_t*/* addr, uint32_t val, double maxWaitMilliseconds) {
   // nop