ports-mgmt/pkg: Remove pre-everything target

It displays messages related to conversion from ancient pkg_* tools to
pkg. But support of the former ended with FreeBSD 9 and ports
framework doesn't support them either.

Reviewed by:	bapt
Differential Revision:	https://reviews.freebsd.org/D44902

ports-mgmt/pkg/Makefile

@@ -41,30 +41,6 @@ MAKE_ARGS+=	DEBUG_FLAGS="${DEBUG_FLAGS}"
 .if ${WITH_PKG} == devel
 IGNORE=	WITH_PKG is defined to 'devel', this version is the stable one
 .endif
-.if exists(${LOCALBASE}/sbin/pkg_info) || exists(/usr/sbin/pkg_info)
-NB_OLDPKGS!=	pkg_info 2>/dev/null | wc -l
-.if exists(${PKG_BIN})
-NB_NEWPKGS!=	${PKG_INFO} -aq | wc -l
-.else
-NB_NEWPKGS=	0
-.endif
-# Only show the pre-everything notice if they have not already
-# converted any packages
-.if ${NB_OLDPKGS} > 0 && ${NB_NEWPKGS} == 0 && !defined(UPGRADEPKG)
-
-pre-everything::
-	@${ECHO_CMD} "You are about to convert your system to pkg while you have ports/packages"; \
-	 ${ECHO_CMD} "installed with the old pkg_install tools."; \
-	 ${ECHO_CMD} ""; \
-	 ${ECHO_CMD} "To switch to pkg:"; \
-	 ${ECHO_CMD} "    1) Install ports-mgmt/pkg"; \
-	 ${ECHO_CMD} "       cd ports-mgmt/pkg && make UPGRADEPKG=1 install clean"; \
-	 ${ECHO_CMD} "    2) Convert your package database by running pkg2ng"; \
-	 ${ECHO_CMD} ""; \
-	exit 1
-
-.endif
-.endif
 .endif
 
 #define PKG_DEPENDS to nothing to avoid infinite loop looking for pkg :)