gpsd: Make sure that LDFLAGS are passed to scons

In newer Poky the LDFLAGS are not passed through the $CC variable
anymore and we need to make sure scons is picking them up. Take an
old Gentoo patch for it.

recipes-extra/gpsd/gpsd/gpsd-3.3-ldflags.patch

@@ -0,0 +1,17 @@
+https://bugs.gentoo.org/391299
+
+split up linking flags into multiple arguments
+
+Index: gpsd-3.10/SConstruct
+===================================================================
+--- gpsd-3.10.orig/SConstruct	2017-03-28 23:47:02.815665786 +0200
++++ gpsd-3.10/SConstruct	2017-03-28 23:47:40.463666285 +0200
+@@ -250,7 +250,7 @@
+             env.Replace(**{j: os.getenv(i)})
+ for flag in ["LDFLAGS", "LINKFLAGS", "SHLINKFLAGS", "CPPFLAGS"]:
+     if os.environ.has_key(flag):
+-        env.MergeFlags({flag : [os.getenv(flag)]})
++        env.MergeFlags({flag : Split(os.getenv(flag))})
+ 
+ 
+ # Keep scan-build options in the environment

recipes-extra/gpsd/gpsd_3.10.bb

@@ -11,6 +11,7 @@ PR = "r3.19"
 SRC_URI = "http://download.savannah.gnu.org/releases/${PN}/${P}.tar.gz \
   file://0002-SConstruct-respect-sysroot-also-in-SPLINTOPTS.patch \
   file://0001-SConstruct-disable-html-and-man-docs-building-becaus.patch \
+  file://gpsd-3.3-ldflags.patch \
   file://no-rpath-please.patch \
   file://gpsd-tsip-pps.patch \
   file://leave-argv-untouched.patch \
@@ -33,6 +34,8 @@ INITSCRIPT_PARAMS = "defaults 35"
 
 export STAGING_INCDIR
 export STAGING_LIBDIR
+export LINKFLAGS="${TARGET_LDFLAGS}"
+export SHLINKFLAGS="${TARGET_LDFLAGS}"
 
 EXTRA_OESCONS = " \
   sysroot=${STAGING_DIR_TARGET} \