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>

grub-core/lib/gnulib-patches/fix-regcomp-resource-leak.patch

@@ -50,7 +50,7 @@
 -  return REG_NOERROR;
 +  return err;
  }
- 
+ 
  /* If it is possible to do searching in single byte encoding instead of UTF-8
 @@ -1677,12 +1677,11 @@ calc_eclosure_iter (re_node_set *new_set, re_dfa_t *dfa, Idx node, bool root)
      {
@@ -106,5 +106,5 @@
 +
 +  return err;
  }
- 
+ 
  /* Functions for token which are used in the parser.  */