pango: fixed prerequirements for the biarch libraries

pango was updated to fix a bug with biarch packages:
- bnc#792646, bnc#803529#c1: Change requires pango-tools in
baselibs.conf to prereq in order to:
+ Match the behavior of the native lib in the .spec file, where
we use (Requires(post).
+ Ensure the right version of pango-tools is installed when the
post script is being executed.

Fixed bugs
bnc#792646
libpango-1_0-0 spits warnings while install
bnc#803529
'zypper dup' hangs at arbitrary(?) packages on Installing......100%[/]
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