build_helper: replace dependency on libpgm-5.x.0 in check_install_oai_software

libpgm-dev will add the dependency on libpgm 5.2.0 or 5.1.0 automatically
according to the ubuntu version

cmake_targets/tools/build_helper

@@ -312,7 +312,6 @@ check_install_oai_software() {
 	libidn11-dev \
 	libmysqlclient-dev  \
 	liboctave-dev \
-	libpgm-5.1 \
 	libpgm-dev \
 	libpython2.7-dev \
 	libsctp1  \