elfutils: clarify licensing info

elfutils libraries are GPLv2+ or LGPLv3+, standalone programs are GPLv3+
(see the NEWS file).
Make the GPLv3+ license tag/file dependant on the programs being
enabled, and make the GPLv2+/LGPLv3+ tag more descriptive.

Signed-off-by: Gustavo Zacarias <gustavo.zacarias@free-electrons.com>
Reviewed-by: Rahul Bedarkar <rahul.bedarkar@imgtec.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/elfutils/elfutils.mk

@@ -8,8 +8,8 @@ ELFUTILS_VERSION = 0.166
 ELFUTILS_SOURCE = elfutils-$(ELFUTILS_VERSION).tar.bz2
 ELFUTILS_SITE = https://fedorahosted.org/releases/e/l/elfutils/$(ELFUTILS_VERSION)
 ELFUTILS_INSTALL_STAGING = YES
-ELFUTILS_LICENSE = GPLv3, GPLv2, LGPLv3
-ELFUTILS_LICENSE_FILES = COPYING COPYING-GPLV2 COPYING-LGPLV3
+ELFUTILS_LICENSE = GPLv2+ or LGPLv3+ (library)
+ELFUTILS_LICENSE_FILES = COPYING-GPLV2 COPYING-LGPLV3
 ELFUTILS_DEPENDENCIES = zlib
 
 # We patch configure.ac
@@ -66,6 +66,8 @@ endif
 
 ifeq ($(BR2_PACKAGE_ELFUTILS_PROGS),y)
 ELFUTILS_CONF_OPTS += --enable-progs
+ELFUTILS_LICENSE := $(ELFUTILS_LICENSE), GPLv3+ (programs)
+ELFUTILS_LICENSE_FILES += COPYING
 else
 ELFUTILS_CONF_OPTS += --disable-progs
 endif