Shorten CMake version used in install destinations

Since commit c9a5f34b (Cleanup use of CMake version in install
destinations, 2013-09-26) we use the full CMake version in default
install destinations.  For rapidly changing versions of the form

 <major>.<minor>.<patch>.<date>-g<commit>[-dirty]

used by developers this is too granular.  Instead use just

 <major>.<minor>.<patch>

as the version for default install destinations.  This will still
be granular enough for unique directories in releases.

On Cygwin continue to use the full ${CMake_VERSION} as was the case
prior to the above-mentioned commit.

Source/CMakeInstallDestinations.cmake

 # Keep formatting here consistent with bootstrap script expectations.
-set(CMAKE_DATA_DIR_DEFAULT "share/cmake-${CMake_VERSION}") # OTHER
 if(BEOS)
+  set(CMAKE_DATA_DIR_DEFAULT "share/cmake-${CMake_VERSION_MAJOR}.${CMake_VERSION_MINOR}.${CMake_VERSION_PATCH}") # HAIKU
   set(CMAKE_MAN_DIR_DEFAULT "documentation/man") # HAIKU
-  set(CMAKE_DOC_DIR_DEFAULT "documentation/doc/cmake-${CMake_VERSION}") # HAIKU
+  set(CMAKE_DOC_DIR_DEFAULT "documentation/doc/cmake-${CMake_VERSION_MAJOR}.${CMake_VERSION_MINOR}.${CMake_VERSION_PATCH}") # HAIKU
 elseif(CYGWIN)
+  set(CMAKE_DATA_DIR_DEFAULT "share/cmake-${CMake_VERSION}") # CYGWIN
   set(CMAKE_DOC_DIR_DEFAULT "share/doc/cmake-${CMake_VERSION}") # CYGWIN
   set(CMAKE_MAN_DIR_DEFAULT "share/man") # CYGWIN
 else()
-  set(CMAKE_DOC_DIR_DEFAULT "doc/cmake-${CMake_VERSION}") # OTHER
+  set(CMAKE_DATA_DIR_DEFAULT "share/cmake-${CMake_VERSION_MAJOR}.${CMake_VERSION_MINOR}.${CMake_VERSION_PATCH}") # OTHER
+  set(CMAKE_DOC_DIR_DEFAULT "doc/cmake-${CMake_VERSION_MAJOR}.${CMake_VERSION_MINOR}.${CMake_VERSION_PATCH}") # OTHER
   set(CMAKE_MAN_DIR_DEFAULT "man") # OTHER
 endif()
 

bootstrap

@@ -28,7 +28,13 @@ cmake_install_dest_default()
 {
   cat "${cmake_source_dir}/Source/CMakeInstallDestinations.cmake" | sed -n '
 /^ *set(CMAKE_'"${1}"'_DIR_DEFAULT.*) # '"${2}"'$/ {
-  s/^ *set(CMAKE_'"${1}"'_DIR_DEFAULT *"\([^"]*\)").*$/\1/;p;q;}
+  s/^ *set(CMAKE_'"${1}"'_DIR_DEFAULT *"\([^"]*\)").*$/\1/
+  s/${CMake_VERSION_MAJOR}/'"${cmake_version_major}"'/
+  s/${CMake_VERSION_MINOR}/'"${cmake_version_minor}"'/
+  s/${CMake_VERSION_PATCH}/'"${cmake_version_patch}"'/
+  p
+  q
+}
 '
 }