Remove trailing whitespace from most CMake and C/C++ code

Our Git commit hooks disallow modification or addition of lines with
trailing whitespace.  Wipe out all remnants of trailing whitespace
everywhere except third-party code.

Run the following shell code:

git ls-files -z -- \
 bootstrap doxygen.config '*.readme' \
 '*.c' '*.cmake' '*.cpp' '*.cxx' \
 '*.el' '*.f' '*.f90' '*.h' '*.in' '*.in.l' '*.java' \
 '*.mm' '*.pike' '*.py' '*.txt' '*.vim' |
egrep -z -v '^(Utilities/cm|Source/(kwsys|CursesDialog/form)/)' |
egrep -z -v '^(Modules/CPack\..*\.in)' |
xargs -0 sed -i 's/ \+$//'

Tests/Testing/CMakeLists.txt

@@ -7,12 +7,12 @@ PROJECT (Testing)
 #
 # Lib and exe path
 #
-SET (LIBRARY_OUTPUT_PATH 
-     ${Testing_BINARY_DIR}/bin/ CACHE PATH 
+SET (LIBRARY_OUTPUT_PATH
+     ${Testing_BINARY_DIR}/bin/ CACHE PATH
      "Single output directory for building all libraries.")
 
-SET (EXECUTABLE_OUTPUT_PATH 
-     ${Testing_BINARY_DIR}/bin/ CACHE PATH 
+SET (EXECUTABLE_OUTPUT_PATH
+     ${Testing_BINARY_DIR}/bin/ CACHE PATH
      "Single output directory for building all executables.")
 
 #

Tests/Testing/DartConfig.cmake

@@ -9,7 +9,7 @@ SET (DROP_SITE_USER "")
 SET (DROP_SITE_PASSWORD "")
 SET (TRIGGER_SITE "")
 
-# Dart server configuration 
+# Dart server configuration
 # SET (CVS_WEB_URL "")
 # SET (CVS_WEB_CVSROOT "")
 # SET (USE_DOXYGEN "Off")