[Tile-serving] [osm2pgsql] Test for minimal pkg-config version incorrect (#397)

[kbalk]

I noticed the following when trying to fix other problems - my system's version of pkg-config is 0.23, yet it passes the check for a version of 0.9.0 or higher.

    checking for pkg-config... /usr/bin/pkg-config
    checking pkg-config is at least version 0.9.0... yes
    checking for PROTOBUF... no
    configure: error: protobuf development libraries not found.
     [~/take2/osm2pgsql]$ pkg-config --version
    0.23

Perhaps I have some older or buggier version of aclocal tools installed, but I thought I'd mention it.  

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Reply to this email directly or view it on GitHub:
https://github.com/openstreetmap/osm2pgsql/issues/397
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