pkgbase: Create a FreeBSD-elftoolchain package

It contain all the binaries and libs from the elftoolchain contrib
project except for libelf which is used everywhere.
All of those tools are never used by the average user.

Sponsored by:	Beckhoff Automation GmbH & Co. KG
Differential Revision:	https://reviews.freebsd.org/D38224

lib/libelftc/Makefile

@@ -1,7 +1,6 @@
 # $FreeBSD$
 .include <bsd.own.mk>
 
-PACKAGE=lib${LIB}
 INTERNALLIB=
 
 ELFTCDIR=	${SRCTOP}/contrib/elftoolchain

release/packages/Makefile.package

@@ -54,6 +54,8 @@ ee_COMMENT= 		Easy Editor Utilities
 ee_DESC= 		Easy Editor Utilities
 efi-tools_COMMENT=	UEFI Utilities
 efi-tools_DESC=		UEFI Utilities
+elftoolchain_COMMENT=	ElfToolchain programs and libraries
+elftoolchain_DESC=	ElfToolchain programs and libraries
 fetch_COMMENT=		Fetch Utility
 fetch_DESC=		Fetch Utility
 ftp_COMMENT=		FTP Utilities

usr.bin/addr2line/Makefile

@@ -2,6 +2,8 @@
 
 .include <src.opts.mk>
 
+PACKAGE=	elftoolchain
+
 ELFTCDIR=	${SRCTOP}/contrib/elftoolchain
 ADDR2LINEDIR=	${ELFTCDIR}/addr2line
 

usr.bin/cxxfilt/Makefile

@@ -2,6 +2,8 @@
 
 .include <src.opts.mk>
 
+PACKAGE=	elftoolchain
+
 ELFTCDIR=	${SRCTOP}/contrib/elftoolchain
 SRCDIR=		${ELFTCDIR}/cxxfilt
 

usr.bin/nm/Makefile

@@ -2,6 +2,8 @@
 
 .include <src.opts.mk>
 
+PACKAGE=	elftoolchain
+
 ELFTCDIR=	${SRCTOP}/contrib/elftoolchain
 NMDIR=		${ELFTCDIR}/nm
 

usr.bin/objcopy/Makefile

@@ -2,6 +2,8 @@
 
 .include <src.opts.mk>
 
+PACKAGE=	elftoolchain
+
 ELFTCDIR=	${SRCTOP}/contrib/elftoolchain
 ELFCOPYDIR=	${ELFTCDIR}/elfcopy
 

usr.bin/readelf/Makefile

@@ -2,6 +2,8 @@
 
 .include <src.opts.mk>
 
+PACKAGE=	elftoolchain
+
 ELFTCDIR=	${SRCTOP}/contrib/elftoolchain
 READELFDIR=	${ELFTCDIR}/readelf
 

usr.bin/size/Makefile

@@ -2,6 +2,8 @@
 
 .include <src.opts.mk>
 
+PACKAGE=	elftoolchain
+
 ELFTCDIR=	${SRCTOP}/contrib/elftoolchain
 SIZEDIR=	${ELFTCDIR}/size