Also add the RegEx validator to the CMake script.
Also add the RegEx validator to the CMake script.

--- a/src/in_xsf_framework/CMakeLists.txt
+++ b/src/in_xsf_framework/CMakeLists.txt
@@ -211,6 +211,7 @@
 	DialogBuilder.h
 	eqstr.h
 	ltstr.h
+	RegExValidator.h
 	TagList.h
 	windowsh_wrapper.h
 	XSFCommon.h
@@ -220,6 +221,7 @@
 set(SOURCES
 	DialogBuilder.cpp
 	in_xsf.cpp
+	RegExValidator.cpp
 	TagList.cpp
 	XSFConfig.cpp
 	XSFConfig_Winamp.cpp