* gthr-gnat.c: Remove #undef UNUSED.
	(__gnat_default_lock, __gnat_default_unlock): Prototype.
	(__gnat_task_lock, __gnat_task_unlock): Make declarations
	prototypes.
	(__gnat_install_locks): Convert declaration to ISO C90, make
	parameter declarations prototypes, and remove blank line.
	* gthr-gnat.h (__gnat_install_locks): Make parameter
	declarations prototypes.

From-SVN: r67238