Hardcode exact version in Source0 field

Hardcode exact version in Source0 field

This commit partially reverts cb142d0b9 ("do not hardcode versio, use
%{version} with substitution instead") as substitution doesn't seem
to be applied while exporting package to OBS.

With previous patch applied ``icu4c-UNEXPANDEDSHELLSCRIPT-src.tgz''
is exported to OBS. RPM handles substitution macro correctly, which
results in build break:

[   33s] error: File /home/abuild/rpmbuild/SOURCES/icu4c-4_8_1_1-src.tgz: No such file or directory

Change-Id: I57ac9555cb61ee6130d0456601a220f63ac81efe