freetype: legal-info: include docs/LICENSE.TXT

LICENSE.TXT gives an overview and explains in detail that freetype is dual
licensed under the FTL and GPLv2+, so also include it in the license files.

Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
(cherry picked from commit 2843b970e749db28eb06d0c5968a60bc006c9747)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/freetype/freetype.mk

@@ -10,7 +10,7 @@ FREETYPE_SITE = http://download.savannah.gnu.org/releases/freetype
 FREETYPE_INSTALL_STAGING = YES
 FREETYPE_MAKE_OPTS = CCexe="$(HOSTCC)"
 FREETYPE_LICENSE = Dual FTL/GPLv2+
-FREETYPE_LICENSE_FILES = docs/FTL.TXT docs/GPLv2.TXT
+FREETYPE_LICENSE_FILES = docs/LICENSE.TXT docs/FTL.TXT docs/GPLv2.TXT
 FREETYPE_DEPENDENCIES = host-pkgconf
 FREETYPE_CONFIG_SCRIPTS = freetype-config