package/x265: bump version to 2.7

Upstream switched to nasm:
https://mailman.videolan.org/pipermail/x265-devel/2018-March/011615.html

Signed-off-by: Bernd Kuhls <bernd.kuhls@t-online.de>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/x265/x265.hash

@@ -1,2 +1,2 @@
 # Locally generated
-sha256 2e53259b504a7edb9b21b9800163b1ff4c90e60c74e23e7001d423c69c5d3d17  x265_2.5.tar.gz
+sha256 d5e75fa62ffe6ed49e691f8eb8ab8c1634ffcc0725dd553c6fdb4d5443b494a2  x265_2.7.tar.gz

package/x265/x265.mk

@@ -4,7 +4,7 @@
 #
 ################################################################################
 
-X265_VERSION = 2.5
+X265_VERSION = 2.7
 X265_SOURCE = x265_$(X265_VERSION).tar.gz
 X265_SITE = https://bitbucket.org/multicoreware/x265/downloads
 X265_LICENSE = GPL-2.0+
@@ -13,7 +13,7 @@ X265_SUBDIR = source
 X265_INSTALL_STAGING = YES
 
 ifeq ($(BR2_i386)$(BR2_x86_64),y)
-X265_DEPENDENCIES += host-yasm
+X265_DEPENDENCIES += host-nasm
 endif
 
 # disable altivec, it has build issues