Add post_regtest_checks check_headers_and_includes to dist_noinst_SCRIPTS.

Also allow a .git directory in check_headers_and_includes to help
people using a git mirror of valgrind/VEX svn.

git-svn-id: svn://svn.valgrind.org/valgrind/trunk@13601 a5019735-40e9-0310-863c-91ae7b9d1cf9
Add opcodes.h to EXTRA_DIST for none/tests/ppc[32|64].

git-svn-id: svn://svn.valgrind.org/valgrind/trunk@13602 a5019735-40e9-0310-863c-91ae7b9d1cf9
Add tests/check_isa-2_07_cap to dist_noinst_SCRIPTS.

git-svn-id: svn://svn.valgrind.org/valgrind/trunk@13603 a5019735-40e9-0310-863c-91ae7b9d1cf9