inconsistent OS_TARGET with mozilla's build

[Tony Chang]

The compile time flag OS_TARGET for firefox_2.0+0dfsg-0ubuntu3 is set to linux-gnu. This is inconsistent with mozilla's builds which set the value to Linux. Extension developers (and possibly firefox itself) expect this value to be consistent across OS platforms.

For example, this value is used by the extension manager for marking extensions only compatible with certain versions of firefox. This is preventing Google Toolbar from being installed:
http://groups.google.com/group/FFToolbar-Group-Bugs/browse_thread/thread/3d48b5cf7413904f

[Sylvain Pasche (sylvain-pasche)]

Another issue is about extensions using platform specific manifest files. These manifests are expected to be in platform/Linux directory inside the extension on Linux platforms. The inconsistent OS_TARGET makes Firefox try to find them incorrectly in platform/linux-gnu.