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/autotoolsprojectmanager/autotoolsprojectmanager.pro

@@ -1,22 +0,0 @@
-include(../../qtcreatorplugin.pri)
-
-HEADERS = autotoolsbuildsystem.h \
-          autotoolsprojectplugin.h\
-          autotoolsbuildconfiguration.h\
-          autotoolsprojectconstants.h\
-          makestep.h\
-          autogenstep.h\
-          autoreconfstep.h\
-          configurestep.h\
-          makefileparserthread.h\
-          makefileparser.h
-
-SOURCES = autotoolsbuildsystem.cpp \
-          autotoolsprojectplugin.cpp\
-          autotoolsbuildconfiguration.cpp\
-          makestep.cpp\
-          autogenstep.cpp\
-          autoreconfstep.cpp\
-          configurestep.cpp\
-          makefileparserthread.cpp\
-          makefileparser.cpp

src/plugins/autotoolsprojectmanager/autotoolsprojectmanager_dependencies.pri

@@ -1,9 +0,0 @@
-QTC_PLUGIN_NAME = AutotoolsProjectManager
-QTC_LIB_DEPENDS += \
-    extensionsystem \
-    utils
-QTC_PLUGIN_DEPENDS += \
-    projectexplorer \
-    coreplugin \
-    cppeditor \
-    qtsupport