Enable extra CodeBlocks generator on Cygwin

This generator builds correctly on Cygwin so it should be enabled.
Change based on patch from issue #10122.

Source/CMakeLists.txt

@@ -167,6 +167,8 @@ SET(SRCS
   cmExportFileGenerator.cxx
   cmExportInstallFileGenerator.h
   cmExportInstallFileGenerator.cxx
+  cmExtraCodeBlocksGenerator.cxx
+  cmExtraCodeBlocksGenerator.h
   cmExtraEclipseCDT4Generator.cxx
   cmExtraEclipseCDT4Generator.h
   cmFileTimeComparison.cxx
@@ -256,10 +258,6 @@ IF(UNIX)
   SET(SRCS ${SRCS} cmGlobalKdevelopGenerator.cxx)
 ENDIF(UNIX)
 
-IF(NOT CYGWIN)
-  SET(SRCS ${SRCS} cmExtraCodeBlocksGenerator.cxx)
-ENDIF(NOT CYGWIN)
-
 # XCode only works on apple
 IF(APPLE)
   SET(SRCS ${SRCS}

Source/cmake.cxx

@@ -82,7 +82,7 @@
 #include "cmCallVisualStudioMacro.h"
 #endif
 
-#if !defined(__CYGWIN__) && !defined(CMAKE_BOOT_MINGW)
+#if !defined(CMAKE_BOOT_MINGW)
 # include "cmExtraCodeBlocksGenerator.h"
 #endif
 
@@ -1653,10 +1653,8 @@ void cmake::AddDefaultExtraGenerators()
   // e.g. kdevelop4 ?
 #endif
 
-#if !defined(__CYGWIN__)
   this->AddExtraGenerator(cmExtraCodeBlocksGenerator::GetActualName(),
                           &cmExtraCodeBlocksGenerator::New);
-#endif
 
 #ifdef CMAKE_USE_ECLIPSE
   this->AddExtraGenerator(cmExtraEclipseCDT4Generator::GetActualName(),