Remove unused Windows build code

Was planning to use libcoverart but that never ended up happening
as it made you download the entire image without being able to
just check.

Author: cyanreg

.github/mingw-build.sh

@@ -5,7 +5,6 @@ buildCyanrip() {
     build_curl
     build_neon
     build_libmusicbrainz
-    # build_libcoverart
     build_ffmpeg
     build_cyanrip
 }
@@ -95,11 +94,6 @@ build_libmusicbrainz() {
     cyan_do_cmakeinstall
 }
 
-build_libcoverart() {
-    cyan_do_vcs "https://github.com/wiiaboo/libcoverart.git" &&
-    cyan_do_cmakeinstall
-}
-
 build_ffmpeg() {
     cyan_do_vcs "https://git.ffmpeg.org/ffmpeg.git"
     cyan_do_separate_confmakeinstall --pkg-config-flags=--static \