Remove CMake-language block-end command arguments

Ancient versions of CMake required else(), endif(), and similar block
termination commands to have arguments matching the command starting the
block.  This is no longer the preferred style.

Run the following shell code:

for c in else endif endforeach endfunction endmacro endwhile; do
    echo 's/\b'"$c"'\(\s*\)(.\+)/'"$c"'\1()/'
done >convert.sed &&
git ls-files -z -- bootstrap '*.cmake' '*.cmake.in' '*CMakeLists.txt' |
egrep -z -v '^(Utilities/cm|Source/kwsys/)' |
egrep -z -v 'Tests/CMakeTests/While-Endwhile-' |
xargs -0 sed -i -f convert.sed &&
rm convert.sed

Tests/CTestScriptMode/CTestTestScriptMode.cmake.in

@@ -5,7 +5,7 @@ set(CMAKE_CMAKE_SYSTEM_NAME "@CMAKE_SYSTEM_NAME@")
 
 if (NOT "${CMAKE_SYSTEM_NAME}" STREQUAL "${CMAKE_CMAKE_SYSTEM_NAME}")
    message(FATAL_ERROR "Error: CMAKE_SYSTEM_NAME is \"${CMAKE_SYSTEM_NAME}\", but should be \"@CMAKE_SYSTEM_NAME@\"")
-endif(NOT "${CMAKE_SYSTEM_NAME}" STREQUAL "${CMAKE_CMAKE_SYSTEM_NAME}")
+endif()
 
 # this seems to be necessary, otherwise ctest complains that these
 # variables are not set: