up to 24.0.1312.45

- added system minizip bcond
fixes to make build with nacl
make build_nexe.py be verbose by default
add system_libexif, system_libmtp, system_opus bconds
merge with master
clean native_client_sdk chrome_frame third_party/{libexif,libmtp,opus}
clean third_party keeping only stuff really needed

727M    chromium-browser-24.0.1312.45/src
792M    chromium-browser-24.0.1312.45-noclean/src

the list came from archlinux PKGBUILD file
ensure linux_link_gsettings is off
another similar fix from gentoo

can see later which variant was correct
use % decorator instead of enforcing 1
fix vpx bcond. now builds with system libvpx
do not keep README.chromium and patches/

they are not neccessary for build
enable system_zlib. builds now with system zlib again
libxml can be cleaned in chromium subdir is kept
no keeping README in almost_strip_dirs
clean more test and not matching platform files
more wrong platform files removal. cleanups
sorted
merge strip_dirs and remove_nonessential_dirs, they do the same removal method
unique