drop ffmpeg from Devel

prepopulate.json

@@ -14859,9 +14859,6 @@
         "festvox-rms-arctic-hts.noarch",
         "festival-devel.x86_64"
       ],
-      "ffmpeg": [
-        "ffmpeg-devel.x86_64"
-      ],
       "fftw": [
         "fftw-mpich-devel.x86_64",
         "fftw-mpich-libs.x86_64",
@@ -17764,6 +17761,7 @@
       "ffmpeg": [
         "ffmpeg.x86_64",
         "ffmpeg-libs.x86_64",
+        "ffmpeg-devel.x86_64",
         "libavcodec-freeworld.x86_64",
         "libavdevice.x86_64"
       ],