Add debug.h to list of GIT_HEADER_FILES in src/CMakeLists.txt.
Add debug.h to list of GIT_HEADER_FILES in src/CMakeLists.txt.

nickerso/libcellml,hsorby/libcellml,nickerso/libcellml,cellml/libcellml,MichaelClerx/libcellml,hsorby/libcellml,cellml/libcellml,nickerso/libcellml,nickerso/libcellml,cellml/libcellml,MichaelClerx/libcellml,hsorby/libcellml,cellml/libcellml,hsorby/libcellml,MichaelClerx/libcellml