Update external links to CMake documentation

We don't support CMake version 2 anymore. Instead of just updating
to a newer (but fixed) version let's link to the latest
documentation. This might create a bigger risk that links get
stale, but hopefully let people find always the latest information.

Task-number: QTBUG-72159
Change-Id: I082de80cf9ee107b5d017ab8ad6369f2448b0e1b
Reviewed-by: Leena Miettinen <[email protected]>

Author: kkoehne

doc/global/externalsites/external-resources.qdoc

@@ -62,28 +62,27 @@
 */
 
 /*!
-    \externalpage http://www.cmake.org/cmake/help/v2.8.11/cmake.html#command:find_package
+    \externalpage https://cmake.org/cmake/help/latest/command/find_package.html
     \title CMake find_package Documentation
 */
 
 /*!
-    \externalpage http://www.cmake.org/cmake/help/v2.8.11/cmake.html#prop_tgt:AUTOMOC
+    \externalpage https://cmake.org/cmake/help/latest/manual/cmake-qt.7.html#automoc
     \title CMake AUTOMOC Documentation
 */
 
-
 /*!
-    \externalpage http://www.cmake.org/cmake/help/v2.8.11/cmake.html#prop_tgt:LOCATION
+    \externalpage https://cmake.org/cmake/help/latest/prop_tgt/LOCATION.html
     \title CMake LOCATION Documentation
 */
 
 /*!
-    \externalpage http://www.cmake.org/cmake/help/v2.8.11/cmake.html#prop_tgt:POSITION_INDEPENDENT_CODE
+    \externalpage https://cmake.org/cmake/help/latest/prop_tgt/POSITION_INDEPENDENT_CODE.html
     \title CMake POSITION_INDEPENDENT_CODE Documentation
 */
 
 /*!
-    \externalpage http://www.cmake.org/cmake/help/v2.8.11/cmake.html#command:target_link_libraries
+    \externalpage https://cmake.org/cmake/help/latest/command/target_link_libraries.html
     \title CMake target_link_libraries Documentation
 */