depends: add 60sec patch. Necessary on osx/linux, probably fixes android issues as well
depends: gplv3 default on
depends: hook up a variable for probing native builds
depends: ensure that android/darwin are always setup as cross
depends: help non-cross builds find libs (like X11) that aren't built by depends
depends: remove redundant checks. These were moved into the split dirs
depends: fix depends config.site check
depends: add a test-dependencies target for verifying our dependency tree

For each lib, delete staging, make distclean in depends, build the lib's
dependencies, then build the lib. This effectively walks down the entire tree
from each and every leaf. Libs will be rebuilt multiple times. It will take
FOREVER. But if it is successful, it's almost certain that our dependency
tree is stable.
depends: dependency fixes found by test-dependencies
depends: fix samba build in linux, libreplace_cv_HAVE_GETADDRINFO=no should only be yes for some AIX
depends: fix toolchain defaults
depends: combine native builds and buildtools
depends: native sdl_image needs png/jpeg/tiff
depends: drop help2man, it's not needed
depends: nuke help2man
depends: gettext: minimize build
depends: libjpeg-turbo: drop yasm dependency and make build more reliable
depends: sdl: drop yasm dependency and remove stale gitignore references
depends: python: fix parallel build
depends: mysql: drop readline requirement

We trick mysql by telling it to use its own readline for the console, but then
we skip the build of the console so that readline is never built/used.