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/ \+$//'

Source/cmMacroCommand.h

@@ -20,11 +20,11 @@ class cmMacroFunctionBlocker : public cmFunctionBlocker
 public:
   cmMacroFunctionBlocker() {this->Depth=0;}
   virtual ~cmMacroFunctionBlocker() {}
-  virtual bool IsFunctionBlocked(const cmListFileFunction&, 
+  virtual bool IsFunctionBlocked(const cmListFileFunction&,
                                  cmMakefile &mf,
                                  cmExecutionStatus &);
   virtual bool ShouldRemove(const cmListFileFunction&, cmMakefile &mf);
-  
+
   std::vector<std::string> Args;
   std::vector<cmListFileFunction> Functions;
   int Depth;