Add more license tags with SPDX identifiers

Note, that licensing stuff is a nightmare: many packages does not clearly
state their licenses, and often multiple source files are simply copied
together - each with different licensing information in the file headers.

I tried hard to ensure, that the license information extracted into the OpenWRT's
makefiles fit the "spirit" of the packages, e.g. such small packages which
come without a dedicated source archive "inherites" the OpenWRT's own license
in my opinion.

However, I can not garantee that I always picked the correct information
and/or did not miss license information.

Signed-off-by: Michael Heimpold <mhei@heimpold.de>

SVN-Revision: 43155

package/network/config/soloscli/Makefile

@@ -16,6 +16,9 @@ PKG_SOURCE_URL:=@SF/openadsl
 PKG_MD5SUM:=c398866de3c059b14eb953c89d698124
 PKG_LICENSE:=GPL-2.0
 
+PKG_LICENSE:=GPL-2.0
+PKG_LICENSE_FILES:=soloscli/COPYING.GPL
+
 PKG_BUILD_DIR:=$(BUILD_DIR)/solos-pci-$(PKG_VERSION)
 PKG_BUILD_PARALLEL:=1