*filter.conf/*.sty: use symlinks to build, common

$(OSMO_GSM_MANUALS_DIR) is used in most places to reference to the top
dir, which contains "build" and "common". But not in the asciidoc
mscgen filter configurations, and in the custom LaTeX style. They have
../common or ../build hardcoded, which won't work anymore when the
project specific files will be in another repository.

Update the Makefiles to create symlinks to "build" and "common" in the
dir where the build was started. Use ./common in the files that had
../common hardcoded, and do the same for ./build.

Update the Makefile.common.inc comment to refer to common targets in
general, so we don't need to list each single one there (like the new
'common' and 'build' targets).

I've also thought about using variables there, but this would only work
for the asciidoc files, not for the .sty file. We would need to
generate the latter from another file and replace the variable
dynamically. Having the symlinks instead seemed to be slightly easier.

(moving manuals to project repositories 7/19)

Related: OS#3385
Change-Id: I4cfd1a9ef482d382f10cdf060e8e2cba81852864

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