Use CMAKE_COMMAND variable instead of hard coded cmake executable name for better portability.

git-svn-id: svn://svn.code.sf.net/p/tigervnc/code/trunk@5088 3789f03b-4d11-0410-bbf8-ca57d06f2519
diff --git a/cmake/Modules/CMakeMacroLibtoolFile.cmake b/cmake/Modules/CMakeMacroLibtoolFile.cmake
index 0cf7b9f..0afb7a6 100644
--- a/cmake/Modules/CMakeMacroLibtoolFile.cmake
+++ b/cmake/Modules/CMakeMacroLibtoolFile.cmake
@@ -101,8 +101,8 @@
   # Add custom command to symlink the static library so that autotools finds
   # the library in .libs.  These are executed after the specified target build.
   add_custom_command(TARGET ${_target} POST_BUILD COMMAND 
-    cmake -E make_directory "${CMAKE_CURRENT_BINARY_DIR}/.libs")
+    "${CMAKE_COMMAND}" -E make_directory "${CMAKE_CURRENT_BINARY_DIR}/.libs")
   add_custom_command(TARGET ${_target} POST_BUILD COMMAND
-    cmake -E create_symlink ${_target_location} "${CMAKE_CURRENT_BINARY_DIR}/.libs/${_lname}${CMAKE_STATIC_LIBRARY_SUFFIX}")
+    "${CMAKE_COMMAND}" -E create_symlink ${_target_location} "${CMAKE_CURRENT_BINARY_DIR}/.libs/${_lname}${CMAKE_STATIC_LIBRARY_SUFFIX}")
 
 endmacro()