package/tesseract-ocr: fix license

COPYING has been removed since version 4.1.0 and
https://github.com/tesseract-ocr/tesseract/commit/618489290536282a59ed7a71381ca083d9a7586a

So replace COPYING by LICENSE

Fixes:
 - http://autobuild.buildroot.org/results/a3cff9747be539bdaffde3926f995467f33428c0

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Acked-by: Gilles Talis <gilles.talis@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

package/tesseract-ocr/tesseract-ocr.hash

@@ -1,6 +1,6 @@
 # locally computed
 sha256  5c5ed5f1a76888dc57a83704f24ae02f8319849f5c4cf19d254296978a1a1961  tesseract-ocr-4.1.0.tar.gz
-sha256  d770c1ac1235bc018530701da1ce453367f7952a3075d12b9029f81a26c05f13  COPYING
+sha256  cfc7749b96f63bd31c3c42b5c471bf756814053e847c10f3eb003417bc523d30  LICENSE
 sha256  daa0c97d651c19fba3b25e81317cd697e9908c8208090c94c3905381c23fc047  eng.traineddata
 sha256  eac01c1d72540d6090facb7b2f42dd0a2ee8fc57c5be1b20548ae668e2761913  fra.traineddata
 sha256  896b3b4956503ab9daa10285db330881b2d74b70d889b79262cc534b9ec699a4  deu.traineddata

package/tesseract-ocr/tesseract-ocr.mk

@@ -8,7 +8,7 @@ TESSERACT_OCR_VERSION = 4.1.0
 TESSERACT_OCR_DATA_VERSION = 4.0.0
 TESSERACT_OCR_SITE = $(call github,tesseract-ocr,tesseract,$(TESSERACT_OCR_VERSION))
 TESSERACT_OCR_LICENSE = Apache-2.0
-TESSERACT_OCR_LICENSE_FILES = COPYING
+TESSERACT_OCR_LICENSE_FILES = LICENSE
 
 # Source from github, no configure script provided
 TESSERACT_OCR_AUTORECONF = YES