Tools: Add a CMakeExecutable parameter to win-setup.ps1.

52054046c1 switched archive extraction from 7Zip to CMake. This removed
a dependency on 7Zip, but assumed that CMake was in our PATH.  Add a
CMakeExecutable to win-setup.ps1 and use it in CMakeLists.txt to pass
the value of CMAKE_COMMAND.

CMakeLists.txt

@@ -181,12 +181,13 @@ and CPU target ${WIRESHARK_TARGET_PROCESSOR_ARCHITECTURE}"
 		# Download third-party libraries
 		file (TO_NATIVE_PATH ${CMAKE_SOURCE_DIR}/tools/win-setup.ps1 _win_setup)
 		file (TO_NATIVE_PATH ${_PROJECT_LIB_DIR} _ws_lib_dir)
+		file (TO_NATIVE_PATH ${CMAKE_COMMAND} _win_cmake_command)
 
 		# Is it possible to have a one-time, non-cached option in CMake? If
 		# so, we could add a "-DFORCE_WIN_SETUP" which passes -Force to
 		# win-setup.ps1.
 		execute_process(
-			COMMAND ${POWERSHELL_COMMAND} "\"${_win_setup}\"" -Destination "${_ws_lib_dir}" -Platform ${WIRESHARK_TARGET_PLATFORM}
+			COMMAND ${POWERSHELL_COMMAND} "\"${_win_setup}\"" -Destination "${_ws_lib_dir}" -Platform ${WIRESHARK_TARGET_PLATFORM} -CMakeExecutable "\"${_win_cmake_command}\""
 			RESULT_VARIABLE _win_setup_failed
 			ERROR_VARIABLE _win_setup_error_output
 		)

tools/win-setup.ps1

@@ -29,9 +29,13 @@ contain the pattern "wireshark-*-libs".
 .PARAMETER Platform
 Target platform. Must be "win64".
 
+.PARAMETER CMakeExecutable
+Specifies the path to the CMake executable, which is used to extract archives.
+
 .INPUTS
 -Destination Destination directory.
 -Platform Target platform.
+-CMakeExecutable Path to CMake.
 
 .OUTPUTS
 A set of libraries required to compile Wireshark on Windows, along with
@@ -51,7 +55,12 @@ Param(
     [Parameter(Mandatory=$true, Position=1)]
     [ValidateSet("win64")]
     [String]
-    $Platform
+    $Platform,
+
+    [Parameter(Mandatory=$false, Position=3)]
+    [ValidateScript({$_ | Test-Path -Type leaf })]
+    [String]
+    $CMakeExecutable = "CMake"
 )
 
 # Variables
@@ -220,7 +229,7 @@ function DownloadArchive($fileName, $fileHash, $subDir) {
     $activity = "Extracting into $($archiveDir)"
     Write-Progress -Activity "$activity" -Status "Extracting $archiveFile using CMake ..."
     Push-Location "$archiveDir"
-    & cmake -E tar xf "$archiveFile" 2>&1 | Set-Variable -Name CMakeOut
+    & "$CMakeExecutable" -E tar xf "$archiveFile" 2>&1 | Set-Variable -Name CMakeOut
     $cmStatus = $LASTEXITCODE
     Pop-Location
     Write-Progress -Activity "$activity" -Status "Done" -Completed