audio/mp3c: Remove expired port:

2023-03-31 audio/mp3c: Abandonware, last release in 2009. Please consider using audio/cyanrip or audio/abcde

Author: 5u623l20

MOVED

@@ -17837,3 +17837,4 @@ audio/id3ed||2023-03-31|Has expired: Abandonware and obsolete, doesn't support I
 audio/id3ren||2023-03-31|Has expired: Abandonware and obsolete, doesn't support ID3v2 tagging
 audio/kexis||2023-03-31|Has expired: Abandonware, niche format that never got any traction and no release in 18 years. Consider using audio/flac or audio/wavpack instead
 audio/libworkman||2023-03-31|Has expired: Abandonware, no development in 20+ years
+audio/mp3c||2023-03-31|Has expired: Abandonware, last release in 2009. Please consider using audio/cyanrip or audio/abcde

audio/Makefile

@@ -483,7 +483,6 @@
     SUBDIR += mp3asm
     SUBDIR += mp3blaster
     SUBDIR += mp3burn
-    SUBDIR += mp3c
     SUBDIR += mp3check
     SUBDIR += mp3ck
     SUBDIR += mp3gain