[Bug-wget] Remove most warnings for missing extern

[Darshit Shah]

Clang provides some warnings for missing extern declarations for non-static 
variables. The following two patches clear most of them. I can currently see 
only more such warning which is caused by build_info.c. To fix this, someone 
will have to hack on the build_info.px perl script.

--
Thanking You,
Darshit Shah

0001-Declare-externs-for-generated-strings-in-version.c.patch
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0002-Fix-location-of-extern-declaration-for-numurls.patch
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