package/libsquish: fix legal-info

Fixes
http://autobuild.buildroot.net/results/4f8/4f81644ca2e0ec4064f43c6cb00f2d5c858bbf77/

Signed-off-by: Bernd Kuhls <bernd.kuhls@t-online.de>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/libsquish/libsquish.mk

@@ -10,7 +10,7 @@ LIBSQUISH_SITE = http://downloads.sourceforge.net/project/libsquish
 LIBSQUISH_INSTALL_STAGING = YES
 LIBSQUISH_STRIP_COMPONENTS = 0
 LIBSQUISH_LICENSE = MIT
-LIBSQUISH_LICENSE_FILES = README
+LIBSQUISH_LICENSE_FILES = LICENSE.txt
 
 define LIBSQUISH_BUILD_CMDS
 	$(TARGET_CONFIGURE_OPTS) $(MAKE) -C $(@D)