Remove WITHOUT_BZIP2, WITHOUT_BZIP2_SUPPORT

WITHOUT_BZIP2_SUPPORT only affects a single binary, gzip(1); it doesn't
remove bzip2 support from other bits (e.g., libarchive) and there are
no similar options for gzip, xz or zstd.

WITHOUT_BZIP2 has not done anything at all since it was first added
in 2007.

MFC after:	never
Discussed on:	arch@
Reviewed by:	imp, des, adrian, delphij, emaste
Differential Revision:	https://reviews.freebsd.org/D56148
Sponsored by:		https://www.patreon.com/bsdivy

share/man/man5/src.conf.5

@@ -1,5 +1,5 @@
 .\" DO NOT EDIT-- this file is @generated by tools/build/options/makeman.
-.Dd April 2, 2026
+.Dd April 3, 2026
 .Dt SRC.CONF 5
 .Os
 .Sh NAME
@@ -315,21 +315,6 @@ and related programs.
 Do not build or install
 .Xr bsnmpd 1
 and related libraries and data files.
-.It Va WITHOUT_BZIP2
-Do not build contributed bzip2 software as a part of the base system.
-.Bf -symbolic
-The option has no effect yet.
-.Ef
-When set, these options are also in effect:
-.Pp
-.Bl -inset -compact
-.It Va WITHOUT_BZIP2_SUPPORT
-(unless
-.Va WITH_BZIP2_SUPPORT
-is set explicitly)
-.El
-.It Va WITHOUT_BZIP2_SUPPORT
-Build some programs without optional bzip2 support.
 .It Va WITHOUT_CALENDAR
 Do not build
 .Xr calendar 1 .