pcre2: add patch fixing a build issue on m68k

A pretty nasty difference in alignment rules between most
architectures and m68k lead pcre2 to fail building its 16-bit and
32-bit variants on m68k. This commit adds a patch that fixes that.

Fixes:

  http://autobuild.buildroot.net/results/f6a45df5cb80e3fd94d57163bd28a0014a02bf4/



Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>