make "make install" also install headers and pkgconfig files

See https://code.google.com/p/google-breakpad/issues/detail?id=219

R=vapier@chromium.org

Review URL: https://breakpad.appspot.com/1114002

git-svn-id: http://google-breakpad.googlecode.com/svn/trunk@1364 4c0a9323-5329-0410-9bdc-e9ce6186880e
update svn:ignore

git-svn-id: http://google-breakpad.googlecode.com/svn/trunk@1365 4c0a9323-5329-0410-9bdc-e9ce6186880e