configure: use shorter variable name for "libavdevice_pc_deps"

This is in line with the new name for the libavfilter variable.
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

configure

@@ -4719,13 +4719,13 @@ enabled libavfilter_deps_swresample && prepend lavfi_libs "libswresample${build_
 enabled libavfilter_deps_postproc   && prepend lavfi_libs "libpostproc${build_suffix} = $LIBPOSTPROC_VERSION,"
 lavfi_libs=${lavfi_libs%, }
 
-libavdevice_pc_deps="libavformat${build_suffix} = $LIBAVFORMAT_VERSION"
-enabled lavfi_indev && prepend libavdevice_pc_deps "libavfilter${build_suffix} = $LIBAVFILTER_VERSION,"
+lavd_libs="libavformat${build_suffix} = $LIBAVFORMAT_VERSION"
+enabled lavfi_indev && prepend lavd_libs "libavfilter${build_suffix} = $LIBAVFILTER_VERSION,"
 
 pkgconfig_generate libavutil "FFmpeg utility library" "$LIBAVUTIL_VERSION" "$LIBM"
 pkgconfig_generate libavcodec "FFmpeg codec library" "$LIBAVCODEC_VERSION" "$extralibs" "libavutil${build_suffix} = $LIBAVUTIL_VERSION"
 pkgconfig_generate libavformat "FFmpeg container format library" "$LIBAVFORMAT_VERSION" "$extralibs" "libavcodec${build_suffix} = $LIBAVCODEC_VERSION"
-pkgconfig_generate libavdevice "FFmpeg device handling library" "$LIBAVDEVICE_VERSION" "$extralibs" "$libavdevice_pc_deps"
+pkgconfig_generate libavdevice "FFmpeg device handling library" "$LIBAVDEVICE_VERSION" "$extralibs" "$lavd_libs"
 pkgconfig_generate libavfilter "FFmpeg audio/video filtering library" "$LIBAVFILTER_VERSION" "$extralibs" "$lavfi_libs"
 pkgconfig_generate libpostproc "FFmpeg postprocessing library" "$LIBPOSTPROC_VERSION" "" "libavutil${build_suffix} = $LIBAVUTIL_VERSION"
 pkgconfig_generate libavresample "Libav audio resampling library" "$LIBAVRESAMPLE_VERSION" "$extralibs" "libavutil${build_suffix} = $LIBAVUTIL_VERSION"