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/utils/fbtest/Makefile

@@ -12,6 +12,9 @@ PKG_RELEASE:=1
 
 PKG_BUILD_DIR := $(BUILD_DIR)/$(PKG_NAME)
 
+PKG_LICENSE:=GPL-2.0+
+PKG_LICENSE_FILES:=
+
 include $(INCLUDE_DIR)/package.mk
 
 define Package/fbtest