tccpe.c: fix msvcrt.dll handle leak on Windows ARM64

pe_get_process_msvcrt_handle() used LoadLibraryA which increments the
module reference count, but never called FreeLibrary to release it.

Use GetModuleHandleA instead, which returns a handle to the already-
loaded msvcrt.dll module without incrementing the reference count.
This is the correct API for accessing system DLLs that are already
mapped into the process address space.

tccpe.c

@@ -40,7 +40,7 @@ static HMODULE pe_get_process_msvcrt_handle(void)
     wait_sem(&pe_msvcrt_sem);
     dll = handle;
     if (!dll) {
-        dll = LoadLibraryA("msvcrt.dll");
+        dll = GetModuleHandleA("msvcrt.dll");
         if (dll)
             handle = dll;
     }