CI: New way to determnine libdir

We were using the presence of /usr/lib64 to determine where
shared libraries should be installed.  This only existed on
Redhat based systems and was safe.  If it existed, use it,
otherwise use /usr/lib.

Unfortunately, Ubuntu 19 decided to create a /usr/lib64 BUT
NOT INCLUDE IT IN THE DEFAULT ld.so.conf.  So if anything is
installed there, it won't work.

The new method, just looks for $ID in /etc/os-release and if it's
centos or fedora, uses /usr/lib64 and if ubuntu, uses /usr/lib.

NOTE:  This applies only to the CI scripts.  Normal asterisk
build and install is not affected.

Change-Id: Iad66374b550fd89349bedbbf2b93f8edd195a7c3

tests/CI/buildAsterisk.sh

@@ -89,7 +89,7 @@ runner ulimit -a
 
 MAKE=`which make`
 PKGCONFIG=`which pkg-config`
-[ -d /usr/lib64 ] && _libdir=/usr/lib64
+_libdir=`${CIDIR}/findLibdir.sh`
 
 common_config_args="--prefix=/usr ${_libdir:+--libdir=${_libdir}} --sysconfdir=/etc --with-pjproject-bundled"
 $PKGCONFIG 'jansson >= 2.11' || common_config_args+=" --with-jansson-bundled"

tests/CI/findLibdir.sh

@@ -0,0 +1,14 @@
+#!/usr/bin/env bash
+
+source /etc/os-release
+
+case $ID in
+	centos)
+		echo /usr/lib64
+		;;
+	fedora)
+		echo /usr/lib64
+		;;
+	ubuntu)
+		echo /usr/lib
+esac