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/StringFileTest/CMakeLists.txt

@@ -149,8 +149,8 @@ IF(NOT "$ENV{x+(y)}" STREQUAL "Obscure environment variable value")
 ENDIF()
 
 # Make directories test
-FILE(MAKE_DIRECTORY 
-  "${CMAKE_CURRENT_BINARY_DIR}/Includes" 
+FILE(MAKE_DIRECTORY
+  "${CMAKE_CURRENT_BINARY_DIR}/Includes"
   "${CMAKE_CURRENT_BINARY_DIR}/Directory1"
   "${CMAKE_CURRENT_BINARY_DIR}/Directory2"
   )

Tests/StringFileTest/InputFile.h.in

@@ -3,7 +3,7 @@
 /* This should be configured to a define.  */
 #cmakedefine TEST_DEFINED @TEST_DEFINED@
 /* This should be configured to a commented undef with the curlies in place */
-#cmakedefine TEST_NOT_DEFINED ${TEST_NOT_DEFINED} 
+#cmakedefine TEST_NOT_DEFINED ${TEST_NOT_DEFINED}
 
 /* This complicated line should be configured unchanged: */
 static const char* configvar =
@@ -34,5 +34,5 @@ int CheckMethod(const char* var, const char* val )
   return 1;
 #else
   return 0;
-#endif  
+#endif
 }

Tests/StringFileTest/StringFile.cxx

@@ -26,6 +26,6 @@ int main(int, char*[])
   res += CheckMethod(relpath, "../../X11R6/bin/xnest");
   res += CheckMethod(configvar,
                      "@$@$junk =~ s/#$xyz#/$foo_bar{$wibble}->{$xyz}/;@@");
-  
+
   return res;
 }