gpsd: fix clang buid via export CC explicitly

gpsd scons build system defaults CC to 'gcc', which prevents clang
toolchain to be used.

Export CC explicitly via environment to override default assignment in
scons.

Signed-off-by: Andrey Zhizhikin <andrey.z@gmail.com>
Signed-off-by: Khem Raj <raj.khem@gmail.com>

meta-oe/recipes-navigation/gpsd/gpsd_3.23.1.bb

@@ -48,6 +48,7 @@ do_compile:prepend() {
     export PKG_CONFIG_PATH="${PKG_CONFIG_PATH}"
     export PKG_CONFIG="PKG_CONFIG_SYSROOT_DIR=\"${PKG_CONFIG_SYSROOT_DIR}\" pkg-config"
     export STAGING_PREFIX="${STAGING_DIR_HOST}/${prefix}"
+    export CC="${CC}"
     export LD="${CC}"
     export LINKFLAGS="${LDFLAGS}"
 }