fixes for Makefile pkg-plist and build-in ffmpeg

[Evan Martin]

On Sun, Mar 27, 2011 at 5:36 PM, Y. A. <nexther0 at gmail.com> wrote:
> +--- third_party/ffmpeg/ffmpeg.gyp.orig 2011-03-23 10:02:47.000000000 +0200
> ++++ third_party/ffmpeg/ffmpeg.gyp      2011-03-27 15:07:20.000000000 +0300
> +@@ -56,7 +56,7 @@
> +       ['target_arch=="arm"', {
> +         'ffmpeg_asm_lib': 0,
> +       }],
> +-      ['OS=="mac" or OS=="win"', {
> ++      ['OS=="mac" or OS=="win" or OS=="freebsd"', {
> +         'os_config%': '<(OS)',
> +       }, {  # all other Unix OS's use the linux config
> +         'os_config%': 'linux',
> +@@ -82,7 +82,7 @@

I'd be happy to take a patch like this upstream if you think it's correct.
If Linux is the special case, then perhaps simplifying the test to
just 'OS!="linux"' (and fixing the comment below) might be nice.