Create Debian and RPM packages from CMakeLists

Packages must have a name, a version, a section, an architecture, a maintainer, a description (long and summary), dependencies
Shared libraries must be stripped, have soversion, version (debug symbols are found in separate packages), since MODULE is used instead of SHARED it works as a plugin library which is opened using dlopen-like functionality, see:  https://cmake.org/cmake/help/latest/command/add_library.html
Packages must have postin and postun scripts
Since it is not recommended to modify CMAKE_EXE_LINKER_FLAGS, cmake's path variables are used : https://discourse.cmake.org/t/how-do-i-replace-the-compiler-options-for-one-target/7815/5

tools/packages/systemd_scripts/postinst

@@ -0,0 +1,12 @@
+#!/bin/sh
+set -e
+mkdir -p /var/log/oai-log
+echo "Running ldconfig after package installation/upgrade" 2>&1
+if command -v ldconfig >> /var/log/oai-log/oai.log 2>&1; then
+    ldconfig
+else
+    echo "Warning: ldconfig not found"
+fi
+
+
+exit 0