ia64 don't like LDFLAG --no-keep-memory

it's may be a bug of ld

http://sourceware.org/bugzilla/show_bug.cgi?id=15904
remove export-subst in mozilla/addon-sdk/source/.gitattributes

Because it triggers git-tar-tree to expand git vars
document changes and release 24.0-1
Imported Upstream version 24.0.1
Merge tag 'upstream/24.0.1'

Upstream version 24.0.1