osmo-ggsn[master]: build: Remove AC_PROG_CXX, C++ is never used

[Vadim Yanitskiy]

Patch Set 1: Code-Review+1

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Gerrit-MessageType: comment
Gerrit-Change-Id: Ifda126ab2e5fdd98317e723aa6b10d964b4519c2
Gerrit-PatchSet: 1
Gerrit-Project: osmo-ggsn
Gerrit-Branch: master
Gerrit-Owner: roox <mar...@gmx.de>
Gerrit-Reviewer: Jenkins Builder
Gerrit-Reviewer: Pau Espin Pedrol <pes...@sysmocom.de>
Gerrit-Reviewer: Vadim Yanitskiy <axilira...@gmail.com>
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