new package sdl_rwhttp

the test is currently disabled - I still have to fix it
ocaml-native : ocamlbuild was not looking for prefix-ocamlfind
Merge pull request #223 from william3/ocaml-update

ocaml-native : ocamlbuild was not looking for prefix-ocamlfind
Makefile: unexport various *TARGET* variables
Makefile: add settings.mk to failed log output
Makefile: add missing separator to find command
packages freetype libgpg_error libpng pcre: add prefixed *-config links
doc update: add notes about gmake options and settings.mk usage
Merge branch 'stable'
Makefile: create marker directories so --touch works on clean tree
update package sdl_rwhttp
package cfitsio: update checksum
Merge branch 'stable'
package ffmpeg: update and enable libass
package ffmpeg: reorder configure options
updated the checksums for the sdl2 release candidates
mxe-activate: clear env vars on make invocation
Merge branch 'master' of github.com:mxe/mxe
mxe-activate: unset env vars for interactive use
doc update: add notes about $(TARGET)/bin in $PATH and clean environment