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/languageclient/languageclient.pro

@@ -1,53 +0,0 @@
-include(../../qtcreatorplugin.pri)
-
-DEFINES += LANGUAGECLIENT_LIBRARY
-
-HEADERS += \
-    client.h \
-    diagnosticmanager.h \
-    documentsymbolcache.h \
-    dynamiccapabilities.h \
-    languageclient_global.h \
-    languageclientcompletionassist.h \
-    languageclientformatter.h \
-    languageclientfunctionhint.h \
-    languageclienthoverhandler.h \
-    languageclientinterface.h \
-    languageclientmanager.h \
-    languageclientoutline.h \
-    languageclientplugin.h \
-    languageclientquickfix.h \
-    languageclientsettings.h \
-    languageclientsymbolsupport.h \
-    languageclientutils.h \
-    locatorfilter.h \
-    lspinspector.h \
-    progressmanager.h \
-    semantichighlightsupport.h \
-    snippet.h \
-
-SOURCES += \
-    client.cpp \
-    diagnosticmanager.cpp \
-    documentsymbolcache.cpp \
-    dynamiccapabilities.cpp \
-    languageclientcompletionassist.cpp \
-    languageclientformatter.cpp \
-    languageclientfunctionhint.cpp \
-    languageclienthoverhandler.cpp \
-    languageclientinterface.cpp \
-    languageclientmanager.cpp \
-    languageclientoutline.cpp \
-    languageclientplugin.cpp \
-    languageclientquickfix.cpp \
-    languageclientsettings.cpp \
-    languageclientsymbolsupport.cpp \
-    languageclientutils.cpp \
-    locatorfilter.cpp \
-    lspinspector.cpp \
-    progressmanager.cpp \
-    semantichighlightsupport.cpp \
-    snippet.cpp \
-
-RESOURCES += \
-    languageclient.qrc

src/plugins/languageclient/languageclient_dependencies.pri

@@ -1,10 +0,0 @@
-QTC_PLUGIN_NAME = LanguageClient
-
-QTC_LIB_DEPENDS += \
-    utils \
-    languageserverprotocol
-
-QTC_PLUGIN_DEPENDS += \
-    coreplugin \
-    projectexplorer \
-    texteditor