ffmpeg: update rule to copy libs to both sysroot.

rules/ffmpeg/default.bash

@@ -15,13 +15,14 @@ md5=\
 
 configure()
 {
-    $cmd_mkdir build
+    mkdir -p ../build
     ./configure \
         --sysroot="$cfg_dir_toolchain_sysroot" \
-        --prefix="$cfg_dir_builds/ffmpeg/ffmpeg-$version/build/" \
+        --prefix="$cfg_dir_rootfs/usr" \
         --incdir="$cfg_dir_toolchain_sysroot/usr/include" \
         --enable-cross-compile \
         --cross-prefix="$cfg_target_canonical-" \
+        --libdir="$cfg_dir_builds/ffmpeg/build" \
         --target-os="linux" \
         --enable-shared \
         --disable-static \
@@ -40,13 +41,16 @@ host_install()
     $cmd_make \
 	LIBDIR="$cfg_dir_toolchain_sysroot/usr/lib" \
         install-headers
-    $cmd_make install
-    $cmd_cp -r "build/"*        "$cfg_dir_toolchain_sysroot/usr/"
+
+    $cmd_make \
+        install-libs
 }
 
 target_install()
 {
     $cmd_make \
         install-libs
-    $cmd_cp -r "build/"*        "$cfg_dir_rootfs/usr/"
+
+    $cmd_cp -r "$cfg_dir_builds/ffmpeg/build/"* "$cfg_dir_rootfs/usr/lib/"
+    $cmd_cp -r "$cfg_dir_builds/ffmpeg/build/"* "$cfg_dir_toolchain_sysroot/usr/lib/"
 }