lib: add #include "foo.h" lines like in manpages

Should help in alleviating the header mess we have atm.

Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

lib/igt_core.c

@@ -64,6 +64,8 @@
  * @short_description: Core i-g-t testing support
  * @title: i-g-t core
  *
+ * > #include "igt_core.h"
+ *
  * This libary implements the core of the i-g-t test support infrastructure.
  * Main features are the subtest enumeration, cmdline option parsing helpers for
  * subtest handling and various helpers to structure testcases with subtests and