* gthr-win32.h (__gthread_recursive_mutex_t): Use 'unsigned long',
	not Windows 'DWORD'.
	(__GTHREAD_RECURSIVE_MUTEX_INIT_FUNCTION): Correct typo.
	(__GTHREAD_RECURSIVE_MUTEX_INIT_DEFAULT): Likewise.
	(__gthr_win32_recursive_mutex_init_function): Add prototype for
	__GTHREAD_HIDE_WIN32API case..
	(__gthr_win32_recursive_mutex_lock): Likewise.
	(__gthr_win32_recursive_mutex_trylock): Likewise.
	(__gthr_win32_recursive_mutex_unlock): Likewise.
	(__gthread_recursive_mutex_init_function); Add definition for
	__GTHREAD_HIDE_WIN32API case.
	(__gthread_recursive_mutex_lock): Correct call to InterlockedDecrement.
	* config/i386/grthr-win32.c (__gthread_recursive_mutex_lock): Correct
	call to InterlockedDecrement.

Co-Authored-By: Danny Smith <dannysmith@users.sourceforge.net>

From-SVN: r86939