Sandbox awkgram.tab.h

Sandboxing it generates this diff:

  38,39c38,39
  < #ifndef YY_YY_OUT_SOONG_TEMP_SBOX_794A09CEE4E110D9FF38139A8943928FFD7288A5_OUT_AWKGRAM_TAB_H_INCLUDED
  < # define YY_YY_OUT_SOONG_TEMP_SBOX_794A09CEE4E110D9FF38139A8943928FFD7288A5_OUT_AWKGRAM_TAB_H_INCLUDED
  ---
  > #ifndef YY_YY_OUT_AWKGRAM_TAB_H_INCLUDED
  > # define YY_YY_OUT_AWKGRAM_TAB_H_INCLUDED
  280c280
  < #endif /* !YY_YY_OUT_SOONG_TEMP_SBOX_794A09CEE4E110D9FF38139A8943928FFD7288A5_OUT_AWKGRAM_TAB_H_INCLUDED  */
  ---
  > #endif /* !YY_YY_OUT_AWKGRAM_TAB_H_INCLUDED  */

Which is acceptable, the ifdef is based on the path to the file and
just there to prevent duplicate imports.

Bug: 307824623
Test: ./build/soong/tests/genrule_sandbox_test.py awkgram.tab.h
Change-Id: I85c5e0f65e97d18f1aa8b36fa6b19402d2da6c8c