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/ \+$//'

Modules/Platform/UnixPaths.cmake

@@ -52,7 +52,7 @@ LIST(APPEND CMAKE_SYSTEM_INCLUDE_PATH
 
   # Other
   /usr/pkg/include
-  /opt/csw/include /opt/include  
+  /opt/csw/include /opt/include
   /usr/openwin/include
   )
 
@@ -65,7 +65,7 @@ LIST(APPEND CMAKE_SYSTEM_LIBRARY_PATH
 
   # Other
   /usr/pkg/lib
-  /opt/csw/lib /opt/lib 
+  /opt/csw/lib /opt/lib
   /usr/openwin/lib
   )