More CMake documentation updates.

Change-Id: Ia568e0f46e7a38007bb9b8ea3d6c92233921cc46
Reviewed-on: https://code.wireshark.org/review/26504
Reviewed-by: Gerald Combs <gerald@wireshark.org>

INSTALL

@@ -67,10 +67,10 @@ README.windows for those instructions.
    spaces.
 
 7. Run 'cmake <options> <path/to/the/wireshark/sources>' in your build
-   directory. Running 'cmake -L' displays a complete list of options.
+   directory. Running 'cmake -LH <path/to/the/wireshark/sources>'
-   The "Tool Reference" section of Developer's Guide contains general
+   displays a complete list of options. The "Tool Reference" section of
-   instructions for using CMake. Some of the Wireshark-specific options
+   Developer's Guide contains general instructions for using CMake. Some
-   are as follows:
+   of the Wireshark-specific options are as follows:
 
     -G Ninja
         CMake supports many different build systems, including UNIX

docbook/wsdg_src/WSDG_chapter_tools.asciidoc

@@ -194,30 +194,36 @@ Using CMake on Windows is described further in <<ChWin32Generate>>.
 Along with specifying a generator with the `-G` flag you can set variables
 using the `-D` flag. Useful variables and generators include the following:
 
+-DBUILD_wireshark=OFF:: Don't build the Wireshark GUI application.
+Each command line utility has its own BUILD_xxx flag as well. For
+example, you can use -DBUILD_mmdbresolve=OFF to disable mmdbresolve.
+
 -DENABLE_CAP=OFF:: Disable the POSIX capabilities check
 
 -DCMAKE_BUILD_TYPE=Debug:: Enable debugging symbols
 
--DENABLE_GTK3=ON:: Enable GTK+ 3
+-DCARES_INCLUDE_DIR=/your/custom/cares/include, -DCARES_LIBRARY=/your/custom/cares/lib/libcares.so::
+Let you set the path to a locally-compiled version of c-ares. Most
+optional libraries have xxx_INCLUDE_DIR and xxx_LIB flags that let you
+control their discovery.
 
-+++-DCMAKE_C_FLAGS='-Qunused-arguments'+++:: Make ccache and clang work together
 
 -DPYTHON_EXECUTABLE=c:/Python27/python:: Force the Python path. Useful on Windows since Cygwin’s /usrbin/python is a symlink.
 
 -DENABLE_APPLICATION_BUNDLE=OFF:: Disable building an application bundle (Wireshark.app) on macOS
 
-You can list all build variables (with help) by running *`cmake -LH [options]
+You can list all build variables (with help) by running `cmake -LH [options]
-../<Name_of_WS_source_dir>`*. This lists the cache of build variables
+../<Name_of_WS_source_dir>`. This lists the cache of build variables
 after the cmake run. To only view the current cache, add option `-N`.
 
-After running cmake, you can always run *`make help`* to see a list of all possible make targets.
+After running cmake, you can always run `make help` to see a list of all possible make targets.
 
 Note that CMake honors user umask for creating directories as of now. You should set
 the umask explicitly before running the `install` target.
 
 CMake links:
 
-The home page of the CMake project: http://www.cmake.org/
+The home page of the CMake project: https://cmake.org/
 
 Official documentation: https://cmake.org/documentation/