Finished release v2.7.6.11.

* release/v2.7.6.11:
  libgnutls fails to build on CentOS-7
  gettext fails to build on CentOS-7
  TRIVIAL updated README
  Issue #3: purge_sysconfigdata: using Python2.6-compatible string formatting
  Issue #2: openssl ignores LDFLAGS, and therefore has an rpath that does not contain $ORIGIN/../lib
  Added lib64 install paths for gettext on redhat
  HOSTDEV-1585 building libxslt without crypto since we're building libgcrypt anyway
  HOSTDEV-1655 overring pkg-config with compiler and linker flags for nettle, hogweed, tasn and gmp