ffmpeg: nasm is x86 only, so only DEPEND if x86

No need to depend on nasm if we're not going to use it.

(From OE-Core rev: b99ea7f130c3f945af9a09a6ecf85b6ff8f4b710)

Signed-off-by: Ross Burton <ross.burton@arm.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-multimedia/ffmpeg/ffmpeg_7.0.2.bb

@@ -46,7 +46,8 @@ ARM_INSTRUCTION_SET:armv6 = "arm"
 # libpostproc was previously packaged from a separate recipe
 PROVIDES = "libav libpostproc"
 
-DEPENDS = "nasm-native"
+DEPENDS:append:x86 = " nasm-native"
+DEPENDS:append:x86-64 = " nasm-native"
 
 inherit autotools pkgconfig