mpv: Remove references to builddir from mpv binary

Fixes
WARNING: mpv-0.35.1-r0 do_package_qa: QA Issue: File /usr/bin/mpv in package mpv contains reference to TMPDIR [buildpaths]

Signed-off-by: Khem Raj <raj.khem@gmail.com>
(cherry picked from commit 55d92033a2)
Signed-off-by: Armin Kuster <akuster808@gmail.com>

meta-oe/recipes-multimedia/mplayer/mpv_0.35.1.bb

@@ -98,6 +98,10 @@ EXTRA_OECONF = " \
     ${PACKAGECONFIG_CONFARGS} \
 "
 
+do_configure:append() {
+    sed -i -e 's#${WORKDIR}#<WORKDIR>#g' ${B}/config.h
+}
+
 link_waf() {
     ln -s waf-2.0.25 ${S}/waf
 }