package/cmake: bump to version 3.18.6

Update hash of Copyright.txt (year updated and Qt Company Ltd. added:
https://gitlab.kitware.com/cmake/cmake/-/commit/1edc4a8a7e759c4047dd1a1b9864b34f6cb4cc50
https://gitlab.kitware.com/cmake/cmake/-/commit/f8c505d4b30aa636b013486913591060b2040716)

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>

package/cmake/cmake.hash

@@ -1,5 +1,5 @@
-# From https://cmake.org/files/v3.16/cmake-3.16.9-SHA-256.txt
-sha256  1708361827a5a0de37d55f5c9698004c035abb1de6120a376d5d59a81630191f  cmake-3.16.9.tar.gz
+# From https://cmake.org/files/v3.18/cmake-3.18.6-SHA-256.txt
+sha256  124f571ab70332da97a173cb794dfa09a5b20ccbb80a08e56570a500f47b6600  cmake-3.18.6.tar.gz
 
 # Locally calculated
-sha256  dc628fb936a5d229296d42083f9a8218aa32204c016919e784404c9ec58776e9  Copyright.txt
+sha256  131b9ff756b64a25b7461c3c1382e70b16c70a5b4833a1577897fa3ea6d88f8d  Copyright.txt

package/cmake/cmake.mk

@@ -4,8 +4,8 @@
 #
 ################################################################################
 
-CMAKE_VERSION_MAJOR = 3.16
-CMAKE_VERSION = $(CMAKE_VERSION_MAJOR).9
+CMAKE_VERSION_MAJOR = 3.18
+CMAKE_VERSION = $(CMAKE_VERSION_MAJOR).6
 CMAKE_SITE = https://cmake.org/files/v$(CMAKE_VERSION_MAJOR)
 CMAKE_LICENSE = BSD-3-Clause
 CMAKE_LICENSE_FILES = Copyright.txt