improving firefox port

[Mikhail Teterin]

Hello!

The following changes to firefox/Makefile and mozilla/Makefile.common, along 
with attached additional patch (firefox/files/patch-sysbz2) allow:

	1) use of the base system's -lbz2 instead of compiling Mozilla's own;
	2) build and run the vendor's self-checks (yes, I'm still at it :-)

Please, consider committing ASAP. Thank you!

	-mi
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