purge TCF agent cra^Wstuff

it's dead code

src/plugins/debugger/debugger.pro

@@ -70,7 +70,6 @@ SOURCES += breakhandler.cpp \
     name_demangler.cpp
 FORMS += attachexternaldialog.ui \
     attachcoredialog.ui \
-    attachtcfdialog.ui \
     breakbyfunction.ui \
     breakcondition.ui \
     dumperoptionpage.ui \
@@ -86,7 +85,6 @@ false {
 include(cdb/cdb.pri)
 include(gdb/gdb.pri)
 include(script/script.pri)
-include(tcf/tcf.pri)
 include(shared/shared.pri)
 
 OTHER_FILES += Debugger.pluginspec