Fix potentially invalid macro name in generated version header

The generated name could be invalid if the target name contains
characters that are not legal macro identifiers. This commit changes
replaces all illegal characters with the underscore "_".

CMakeLists.txt

@@ -81,6 +81,7 @@ function(packageProject)
       endif()
 
       string(TOUPPER ${PROJECT_NAME} UPPERCASE_PROJECT_NAME)
+      string(REGEX REPLACE [^a-zA-Z0-9] _ UPPERCASE_PROJECT_NAME ${UPPERCASE_PROJECT_NAME})
       configure_file(
         ${PACKAGE_PROJECT_ROOT_PATH}/version.h.in
         ${PROJECT_VERSION_INCLUDE_DIR}/${PROJECT_VERSION_HEADER} @ONLY