tslib: update to 1.8

For those who are interested, the release notes:

	https://github.com/kergoth/tslib/releases

Signed-off-by: Martin Kepplinger <martin.kepplinger@ginzinger.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/tslib/tslib.hash

@@ -1,2 +1,2 @@
-# https://github.com/kergoth/tslib/releases/download/1.7/tslib-1.7.tar.xz.sha256
-sha256  f2a4a416331dd2f38cea84cc526f23da1c342a2588cfae72fe070908f08b5ce8  tslib-1.7.tar.xz
+# https://github.com/kergoth/tslib/releases/download/1.8/tslib-1.8.tar.xz.sha256
+sha256  be00af1ad643e3535b1958e4e48fea9905888489d7f1480a957c9e3d1cbaeac5  tslib-1.8.tar.xz

package/tslib/tslib.mk

@@ -4,7 +4,7 @@
 #
 ################################################################################
 
-TSLIB_VERSION = 1.7
+TSLIB_VERSION = 1.8
 TSLIB_SITE = https://github.com/kergoth/tslib/releases/download/$(TSLIB_VERSION)
 TSLIB_SOURCE = tslib-$(TSLIB_VERSION).tar.xz
 TSLIB_LICENSE = GPL, LGPL