Fix patch creation with GCC 6.1+

Fix patch creation with GCC 6.1+

GCC 6.1+ fixed https://gcc.gnu.org/bugzilla/show_bug.cgi?id=192 which
means that .rodata.str1.[0-9]+ sections are now split by function.  We
could probably be smarter about including just the sections we need, but
for now, simply include the string sections for all functions as is done
for previous versions of GCC.

Signed-off-by: Ross Lagerwall <ross.lagerwall@citrix.com>
Reported-by: M A Young <m.a.young@durham.ac.uk>