bzip2.recipe: Fix build error in ffmpeg with MinGW

include/bzlib.h:114:17: error: two or more data types in declaration specifiers
include/bzlib.h:138:13: error: two or more data types in declaration specifiers
include/bzlib.h:214:21: error: two or more data types in declaration specifiers

Also touch bzip2.recipe so that it gets rebuilt.
3 jobs for fix-ffmpeg-mingw-bzip2 in 48 minutes and 30 seconds (queued for 1 second)
Status Job ID Name Coverage
  Preparation
passed #64060
manifest

00:00:22

 
  Build
passed #64061
cerbero deps fedora x86_64

00:38:17

 
  Full Builds
passed #64062
build cerbero fedora x86_64

00:09:51