bootstrap: Fix patching warnings

bootstrap: Fix patching warnings

Currently bootstrap complains in the following way when
patching gnulib files:

  patching file regcomp.c
  Hunk #2 succeeded at 1029 with fuzz 2.
  Hunk #5 succeeded at 1716 with fuzz 2.
  patching file regexec.c
  patching file base64.c
  patching file regexec.c
  Hunk #1 succeeded at 807 (offset -21 lines).

Let's fix it by adding missing "\f" and amending line
numbers in the patches.

Signed-off-by: Daniel Kiper <daniel.kiper@oracle.com>
Reviewed-by: Alec Brown <alec.r.brown@oracle.com>