This patch tries to tie libhwasan into the GCC build system in the same way
that the other sanitizer runtime libraries are handled.

libsanitizer/ChangeLog:

	* Makefile.am:  Build libhwasan.
	* Makefile.in:  Build libhwasan.
	* asan/Makefile.in:  Build libhwasan.
	* configure:  Build libhwasan.
	* configure.ac:  Build libhwasan.
	* hwasan/Makefile.am: New file.
	* hwasan/Makefile.in: New file.
	* hwasan/libtool-version: New file.
	* interception/Makefile.in: Build libhwasan.
	* libbacktrace/Makefile.in: Build libhwasan.
	* libsanitizer.spec.in: Build libhwasan.
	* lsan/Makefile.in: Build libhwasan.
	* sanitizer_common/Makefile.in: Build libhwasan.
	* tsan/Makefile.in: Build libhwasan.
	* ubsan/Makefile.in: Build libhwasan.