games-fps/xonotic: export CPUOPTIMIZATIONS rather than pass

Handling of this variable changed a bit, and it (now) passes
-mno-avx to avoid subtle errors in physics. There's currently no
reason to override things it adds (+=) so just export it rather
than do a `append-flags -mno-avx` ourselves for parity.

Signed-off-by: Ionen Wolkens <ionen@gentoo.org>

games-fps/xonotic/xonotic-0.8.6.ebuild

@@ -60,13 +60,15 @@ src_prepare() {
 src_compile() {
 	tc-export CC
 
+	# do not pass in array to keep the makefile.inc's += flags
+	local -x CPUOPTIMIZATIONS=${CFLAGS}
+
 	local emakeargs=(
 		-C source/darkplaces
 		DEFAULT_SNDAPI=$(usex alsa ALSA OSS)
 		DP_FS_BASEDIR="${EPREFIX}"/usr/share/${PN}
 		DP_LINK_ODE=$(usex ode shared no)
 		STRIP=:
-		CPUOPTIMIZATIONS="${CFLAGS}"
 		GENTOO_LDFLAGS="${LDFLAGS}"
 	)