package/xxhash: bump version to 0.7.4

Change the hash of the license:
- Copyright message changed from 'present' to 2020
- Link to BSD 2-Clause License changed from http to https

Signed-off-by: Sergio Prado <sergio.prado@e-labworks.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

package/xxhash/xxhash.hash

@@ -1,3 +1,3 @@
 # locally computed
-sha256  7e93d28e81c3e95ff07674a400001d0cdf23b7842d49b211e5582d00d8e3ac3e  xxhash-0.7.2.tar.gz
-sha256  94df5da58df6c83bcc2fc0c84aaad71a0b0fe94625060d6cac000121dda37730  LICENSE
+sha256  4d9706c9da4fbdf901598f5e3b71db0eddd4ac962e827a73ebf75d66dfd820fe  xxhash-0.7.4.tar.gz
+sha256  9da63520e9293d82c4b1613be5c84058cadb82b02f5972179bad13731d589910  LICENSE

package/xxhash/xxhash.mk

@@ -4,7 +4,7 @@
 #
 ################################################################################
 
-XXHASH_VERSION = 0.7.2
+XXHASH_VERSION = 0.7.4
 XXHASH_SITE = $(call github,Cyan4973,xxHash,v$(XXHASH_VERSION))
 XXHASH_LICENSE = BSD-2-Clause (library), GPL-2.0+ (xxhsum)
 XXHASH_LICENSE_FILES = LICENSE