Tests/CompileDefinitions: Avoid spaces in defines on VS 6

The VS 6 IDE does not like spaces in definition values so CMake drops
them and warns.  The Tests/CompileDefinitions test C code that looks for
the dropped definitions already knows to skip them, but CMake still
warns.  Silence the warnings by avoiding such values in the first place
on VS 6.

Tests/CompileDefinitions/CMakeLists.txt

@@ -5,6 +5,7 @@ project(CompileDefinitions)
 
 if ("${CMAKE_GENERATOR}" STREQUAL "Visual Studio 6")
     add_definitions(-DNO_SPACES_IN_DEFINE_VALUES)
+    set(NO_SPACES_IN_DEFINE_VALUES 1)
 endif()
 
 # Use compile flags to tell executables which config is built

Tests/CompileDefinitions/add_definitions_command/CMakeLists.txt

@@ -1,8 +1,15 @@
 
 project(add_definitions_command)
 
-add_definitions(-DCMAKE_IS_FUN -DCMAKE_IS=Fun -DCMAKE_IS_="Fun" -DCMAKE_IS_REALLY="Very Fun")
-add_definitions(-DCMAKE_IS_="Fun" -DCMAKE_IS_REALLY="Very Fun" -DCMAKE_IS_FUN -DCMAKE_IS=Fun)
+add_definitions(-DCMAKE_IS_FUN -DCMAKE_IS=Fun -DCMAKE_IS_="Fun")
+if (NOT NO_SPACES_IN_DEFINE_VALUES)
+  add_definitions(-DCMAKE_IS_REALLY="Very Fun")
+endif()
+add_definitions(-DCMAKE_IS_="Fun")
+if (NOT NO_SPACES_IN_DEFINE_VALUES)
+  add_definitions(-DCMAKE_IS_REALLY="Very Fun")
+endif()
+add_definitions(-DCMAKE_IS_FUN -DCMAKE_IS=Fun)
 add_definitions(-DBUILD_IS_DEBUG=$<CONFIG:Debug> -DBUILD_IS_NOT_DEBUG=$<NOT:$<CONFIG:Debug>>)
 
 add_executable(add_definitions_command_executable ../compiletest.cpp)

Tests/CompileDefinitions/add_definitions_command_with_target_prop/CMakeLists.txt

@@ -7,7 +7,9 @@ add_executable(add_definitions_command_with_target_prop_executable ../compiletes
 
 set_target_properties(add_definitions_command_with_target_prop_executable PROPERTIES COMPILE_DEFINITIONS CMAKE_IS_="Fun")
 
-set_property(TARGET add_definitions_command_with_target_prop_executable APPEND PROPERTY COMPILE_DEFINITIONS CMAKE_IS_REALLY="Very Fun")
+if (NOT NO_SPACES_IN_DEFINE_VALUES)
+  set_property(TARGET add_definitions_command_with_target_prop_executable APPEND PROPERTY COMPILE_DEFINITIONS CMAKE_IS_REALLY="Very Fun")
+endif()
 
 add_definitions(-DCMAKE_IS_FUN)
 

Tests/CompileDefinitions/target_prop/CMakeLists.txt

@@ -5,7 +5,11 @@ add_executable(target_prop_executable ../compiletest.cpp)
 
 set_target_properties(target_prop_executable PROPERTIES COMPILE_DEFINITIONS CMAKE_IS_FUN)
 
-set_property(TARGET target_prop_executable APPEND PROPERTY COMPILE_DEFINITIONS CMAKE_IS_REALLY="Very Fun" CMAKE_IS=Fun)
+if (NOT NO_SPACES_IN_DEFINE_VALUES)
+  set_property(TARGET target_prop_executable APPEND PROPERTY COMPILE_DEFINITIONS CMAKE_IS_REALLY="Very Fun" CMAKE_IS=Fun)
+else()
+  set_property(TARGET target_prop_executable APPEND PROPERTY COMPILE_DEFINITIONS CMAKE_IS=Fun)
+endif()
 set_property(TARGET target_prop_executable APPEND PROPERTY COMPILE_DEFINITIONS CMAKE_IS_FUN CMAKE_IS_="Fun")
 
 set_property(TARGET target_prop_executable APPEND PROPERTY COMPILE_DEFINITIONS