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
diff --git a/configure.ac b/configure.ac
index 72b72d0..8c02f51 100644
--- a/configure.ac
+++ b/configure.ac
@@ -150,5 +150,10 @@
               [selftest=false])
 AM_CONDITIONAL(SELFTEST, test x$selftest = xtrue)
 
-AC_CONFIG_FILES([Makefile])
+AC_CONFIG_FILES(m4_flatten([
+  breakpad.pc
+  breakpad-client.pc
+  Makefile
+]))
+
 AC_OUTPUT