libmagic-mgc: Drop old versioned dependency, also Closes: #1069915

This was used in 2016 with the advent of libmagic-mgc.

debian/control

@@ -49,10 +49,6 @@ Description: Recognize the type of data in a file using "magic" numbers - librar
 Package: libmagic-mgc
 Architecture: any
 Depends: ${misc:Depends},
-Breaks:
-    libmagic1t64 (<< 1:5.28-4~),
-Replaces:
-    libmagic1t64 (<< 1:5.28-4~),
 Section: libs
 Priority: optional
 Multi-Arch: foreign