Document r368281.

Requested by:	adamw
New port: www/p5-Dancer-Plugin-Memcached:

This plugin gives Dancer the ability to get and store page content in a
memcached server, which in specific configurations could give a
performance boost - particulary on GET requests that incur significant
database calls.

WWW: http://search.cpan.org/dist/Dancer-Plugin-Memcached/
Fix all non-x86 builds of math/gsl with a more general approach than the
specifically powerpc patch file.

Drop patch-ieee-utils-fp-freebsd.c alltogether and change the order
of #ifdefs in the setup to pull in fp-gnuc99.c instead of fp-freebsd.cc

Verified on redports for x86 builds and am bumping port revision.

Suggested by:	nathanw
Phabric:	https://reviews.freebsd.org/D787
Reviewed by:	nathanw
Approved by:	bdrewery (mentor)