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/cvs/cvs.pro

@@ -1,15 +0,0 @@
-include(../../qtcreatorplugin.pri)
-
-HEADERS += annotationhighlighter.h \
-    cvsplugin.h \
-    cvseditor.h \
-    cvssubmiteditor.h \
-    cvssettings.h \
-    cvsutils.h
-
-SOURCES += annotationhighlighter.cpp \
-    cvsplugin.cpp \
-    cvseditor.cpp \
-    cvssubmiteditor.cpp \
-    cvssettings.cpp \
-    cvsutils.cpp

src/plugins/cvs/cvs_dependencies.pri

@@ -1,8 +0,0 @@
-QTC_PLUGIN_NAME = CVS
-QTC_LIB_DEPENDS += \
-    extensionsystem \
-    utils
-QTC_PLUGIN_DEPENDS += \
-    texteditor \
-    coreplugin \
-    vcsbase