gpsd: Enable systemd support based on DISTRO_FEATURE

Enabling the "systemd" feature will enable the socket activation
feature used by systemd. This way we can (re-)start the GPSD based
on the socket activation.

recipes-extra/gpsd/gpsd_3.10.bb

@@ -6,7 +6,7 @@ DEPENDS = "ncurses python"
 #DEPENDS = "ncurses libusb1 python"
 PROVIDES = "virtual/gpsd"
 
-PR = "r3.12"
+PR = "r3.13"
 
 SRC_URI = "http://download.savannah.gnu.org/releases/${PN}/${P}.tar.gz \
   file://0002-SConstruct-respect-sysroot-also-in-SPLINTOPTS.patch \
@@ -27,8 +27,6 @@ inherit scons update-rc.d
 INITSCRIPT_NAME = "gpsd"
 INITSCRIPT_PARAMS = "defaults 35"
 
-SYSTEMD_OESCONS ??= "false"
-
 export STAGING_INCDIR
 export STAGING_LIBDIR
 
@@ -59,7 +57,7 @@ EXTRA_OESCONS = " \
   trip='false' \
   tripmate='false' \
   usb='false' \
-  systemd='${SYSTEMD_OESCONS}' \
+  systemd='${@base_contains('DISTRO_FEATURES','systemd','true','false',d)}' \
   chrpath='false' \
 "
 # python='false' \