x264 2197
x264 2197

Upgrade x264 to version 2197, the 2012-06-09 stable tarball.
Add a caveat advising the user to recompile brews that use x264.
Add a conditional when building head that sets `GIT_DIR` and runs
`version.sh` so that folks can easily see the current version.

Because version 2197 was inadvertently used a couple of commits
ago, some folks may have a tarball with this name in their cache
that will fail sha1 check.  Hopefully they will know enough to
delete the version in their cache and attempt the install again.
Compiles well using clang and llvm from XCode-4.3.2 on Lion.

Signed-off-by: Adam Vandenberg <34c2b6407fd5a10249a15d699d40f9ed1782e98c@gmail.com>

aabdnn/homebrew-core,lembacon/homebrew-core,phusion/homebrew-core,lemzwerg/homebrew-core,wolffaxn/homebrew-core,tkoenig/homebrew-core,git-lfs/homebrew-core,BrewTestBot/homebrew-core,zmwangx/homebrew-core,wolffaxn/homebrew-core,j-bennet/homebrew-core,phusion/homebrew-core,jdubois/homebrew-core,lemzwerg/homebrew-core,kunickiaj/homebrew-core,ilovezfs/homebrew-core,makigumo/homebrew-core,mbcoguno/homebrew-core,nandub/homebrew-core,forevergenin/homebrew-core,stgraber/homebrew-core,adam-moss/homebrew-core,mvitz/homebrew-core,maxim-belkin/homebrew-core,passerbyid/homebrew-core,reelsense/homebrew-core,reelsense/homebrew-core,jvillard/homebrew-core,kunickiaj/homebrew-core,uyjulian/homebrew-core,jabenninghoff/homebrew-core,robohack/homebrew-core,dsXLII/homebrew-core,uyjulian/homebrew-core,spaam/homebrew-core,Linuxbrew/homebrew-core,lembacon/homebrew-core,straxhaber/homebrew-core,Homebrew/homebrew-core,ylluminarious/homebrew-core,mbcoguno/homebrew-core,fvioz/homebrew-core,fvioz/homebrew-core,lasote/homebrew-core,stgraber/homebrew-core,rwhogg/homebrew-core,LinuxbrewTestBot/homebrew-core,filcab/homebrew-core,Linuxbrew/homebrew-core,DomT4/homebrew-core,andyjeffries/homebrew-core,jvillard/homebrew-core,mahori/homebrew-core,chrisfinazzo/homebrew-core,sjackman/homebrew-core,lembacon/homebrew-core,cblecker/homebrew-core,adamliter/homebrew-core,mvbattista/homebrew-core,zyedidia/homebrew-core,j-bennet/homebrew-core,straxhaber/homebrew-core,makigumo/homebrew-core,adam-moss/homebrew-core,kuahyeow/homebrew-core,spaam/homebrew-core,mbcoguno/homebrew-core,rwhogg/homebrew-core,JCount/homebrew-core,LinuxbrewTestBot/homebrew-core,grhawk/homebrew-core,nbari/homebrew-core,smessmer/homebrew-core,mvbattista/homebrew-core,DomT4/homebrew-core,passerbyid/homebrew-core,bfontaine/homebrew-core,mfikes/homebrew-core,bfontaine/homebrew-core,zyedidia/homebrew-core,chrisfinazzo/homebrew-core,filcab/homebrew-core,tkoenig/homebrew-core,adamliter/homebrew-core,moderndeveloperllc/homebrew-core,jvehent/homebrew-core,kuahyeow/homebrew-core,JCount/homebrew-core,mvitz/homebrew-core,maxim-belkin/homebrew-core,mfikes/homebrew-core,mvitz/homebrew-core,aren55555/homebrew-core,mahori/homebrew-core,Homebrew/homebrew-core,ylluminarious/homebrew-core,jvillard/homebrew-core,sdorra/homebrew-core,git-lfs/homebrew-core,grhawk/homebrew-core,jvehent/homebrew-core,sdorra/homebrew-core,jdubois/homebrew-core,smessmer/homebrew-core,Moisan/homebrew-core,bcg62/homebrew-core,ShivaHuang/homebrew-core,nandub/homebrew-core,jdubois/homebrew-core,wolffaxn/homebrew-core,bcg62/homebrew-core,dsXLII/homebrew-core,bigbes/homebrew-core,sjackman/homebrew-core,zmwangx/homebrew-core,gserra-olx/homebrew-core,battlemidget/homebrew-core,forevergenin/homebrew-core,bigbes/homebrew-core,ShivaHuang/homebrew-core,FinalDes/homebrew-core,edporras/homebrew-core,battlemidget/homebrew-core,Moisan/homebrew-core,bcg62/homebrew-core,aren55555/homebrew-core,lasote/homebrew-core,ilovezfs/homebrew-core,nbari/homebrew-core,andyjeffries/homebrew-core,cblecker/homebrew-core,BrewTestBot/homebrew-core,robohack/homebrew-core,moderndeveloperllc/homebrew-core,jabenninghoff/homebrew-core,aabdnn/homebrew-core,FinalDes/homebrew-core,gserra-olx/homebrew-core,edporras/homebrew-core