Revert "common/: add support for changelog field."

This reverts commit 8599efd9fd.

common/environment/setup/sourcepkg.sh

@@ -2,7 +2,7 @@
 # the package template (excluding subpackages).
 
 ## VARIABLES
-unset -v pkgname version revision short_desc homepage changelog license maintainer
+unset -v pkgname version revision short_desc homepage license maintainer
 unset -v only_for_archs distfiles checksum build_style nocross broken
 unset -v configure_script configure_args wrksrc build_wrksrc create_wrksrc
 unset -v make_build_args make_check_args make_install_args

common/hooks/do-pkg/00-gen-pkg.sh

@@ -74,7 +74,6 @@ genpkg() {
 		${_alternatives:+--alternatives "${_alternatives}"} \
 		${_preserve:+--preserve} \
 		${tags:+--tags "${tags}"} \
-		${changelog:+--changelog "${changelog}"} \
 		--architecture ${arch} \
 		--homepage "${homepage}" \
 		--license "${license}" \

common/xbps-src/shutils/show.sh

@@ -15,7 +15,6 @@ show_pkg() {
     [ -n "$noarch" ] && echo "noarch:		yes"
     echo "maintainer:	$maintainer"
     [ -n "$homepage" ] && echo "Upstream URL:	$homepage"
-    [ -n "$changelog" ] && echo "Changelog URL:	$changelog"
     [ -n "$license" ] && echo "License(s):	$license"
     [ -n "$build_style" ] && echo "build_style:	$build_style"
     for i in ${configure_args}; do