Remove qmake build files

Removes qmake as a build system for building Qt Creator itself.
Keep them for some tests that are not completely moved to CMake yet.

Change-Id: I846c6ef65626b6dfae6375fdc85d00677aa8c2fb
Reviewed-by: hjk <hjk@qt.io>
Reviewed-by: Christian Kandeler <christian.kandeler@qt.io>
Reviewed-by: Christian Stenger <christian.stenger@qt.io>

src/plugins/valgrind/xmlprotocol/xmlprotocol.pri

@@ -1,27 +0,0 @@
-QT *= network
-
-HEADERS += \
-    $$PWD/frame.h \
-    $$PWD/parser.h \
-    $$PWD/error.h \
-    $$PWD/status.h \
-    $$PWD/suppression.h \
-    $$PWD/threadedparser.h \
-    $$PWD/announcethread.h \
-    $$PWD/stack.h \
-    $$PWD/errorlistmodel.h \
-    $$PWD/stackmodel.h \
-    $$PWD/modelhelpers.h
-
-SOURCES += \
-    $$PWD/error.cpp \
-    $$PWD/frame.cpp \
-    $$PWD/parser.cpp \
-    $$PWD/status.cpp \
-    $$PWD/suppression.cpp \
-    $$PWD/threadedparser.cpp \
-    $$PWD/announcethread.cpp \
-    $$PWD/stack.cpp \
-    $$PWD/errorlistmodel.cpp \
-    $$PWD/stackmodel.cpp \
-    $$PWD/modelhelpers.cpp