MT#55283 install files into /usr (DEP17 M2)

Use the variable from pkg-config as install location for systemd
units/links.

Change-Id: I504eea66b874f70897e8fe0e2527653d56e604c2
Ref: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1060282
(cherry picked from commit 7e140e8a31)

debian/control

@@ -46,8 +46,10 @@ Build-Depends:
  libxtables-dev (>= 1.4) | iptables-dev (>= 1.4),
  markdown,
  pandoc,
+ pkgconf,
  python3,
  python3-websockets,
+ systemd-dev | systemd,
  zlib1g-dev,
 Testsuite: autopkgtest-pkg-dkms
 

debian/ngcp-rtpengine-daemon.links

@@ -1,4 +1,4 @@
-/lib/systemd/system/ngcp-rtpengine-daemon.service	/lib/systemd/system/rtpengine-daemon.service
-/lib/systemd/system/ngcp-rtpengine-daemon.service	/lib/systemd/system/rtpengine.service
-/lib/systemd/system/ngcp-rtpengine-daemon@.service	/lib/systemd/system/rtpengine-daemon@.service
-/lib/systemd/system/ngcp-rtpengine-daemon@.service	/lib/systemd/system/rtpengine@.service
+${env:deb_systemdsystemunitdir}/ngcp-rtpengine-daemon.service	${env:deb_systemdsystemunitdir}/rtpengine-daemon.service
+${env:deb_systemdsystemunitdir}/ngcp-rtpengine-daemon.service	${env:deb_systemdsystemunitdir}/rtpengine.service
+${env:deb_systemdsystemunitdir}/ngcp-rtpengine-daemon@.service	${env:deb_systemdsystemunitdir}/rtpengine-daemon@.service
+${env:deb_systemdsystemunitdir}/ngcp-rtpengine-daemon@.service	${env:deb_systemdsystemunitdir}/rtpengine@.service

debian/ngcp-rtpengine-recording-daemon.links

@@ -1,4 +1,4 @@
-/lib/systemd/system/ngcp-rtpengine-recording-daemon.service	/lib/systemd/system/rtpengine-recording-daemon.service
-/lib/systemd/system/ngcp-rtpengine-recording-daemon.service	/lib/systemd/system/rtpengine-recording.service
-/lib/systemd/system/ngcp-rtpengine-recording-daemon@.service	/lib/systemd/system/rtpengine-recording-daemon@.service
-/lib/systemd/system/ngcp-rtpengine-recording-daemon@.service	/lib/systemd/system/rtpengine-recording@.service
+${env:deb_systemdsystemunitdir}/ngcp-rtpengine-recording-daemon.service	${env:deb_systemdsystemunitdir}/rtpengine-recording-daemon.service
+${env:deb_systemdsystemunitdir}/ngcp-rtpengine-recording-daemon.service	${env:deb_systemdsystemunitdir}/rtpengine-recording.service
+${env:deb_systemdsystemunitdir}/ngcp-rtpengine-recording-daemon@.service	${env:deb_systemdsystemunitdir}/rtpengine-recording-daemon@.service
+${env:deb_systemdsystemunitdir}/ngcp-rtpengine-recording-daemon@.service	${env:deb_systemdsystemunitdir}/rtpengine-recording@.service

debian/rules

@@ -23,6 +23,8 @@ endif
 
 export FIXTURES_PATH = /usr/share/rtpengine-perftest
 
+export deb_systemdsystemunitdir = $(shell pkg-config --variable=systemdsystemunitdir systemd)
+
 %:
 	dh $@