Get rid of EXPLICIT_MOC

Otherwise it generates the following:

Generating moc_pluginmanager_p.cpp
[...]/pluginmanager_p.h: note: No relevant classes found.
No output generated.

The same for:
moc_cppquickfixprojectsettingswidget.cpp / cppquickfixprojectsettingswidget.h
moc_imageviewer.cpp / imageviewer.h
moc_vcpkg_test.cpp / vcpkg_test.h
moc_clangformat-test.cpp / clangformat-test.h

during compilation.

Change-Id: I65ea5a7caeb0607972c09de1de66337cb7df59b8
Reviewed-by: hjk <hjk@qt.io>
Reviewed-by: <github-actions-qt-creator@cristianadam.eu>
Reviewed-by: Cristian Adam <cristian.adam@qt.io>

src/libs/extensionsystem/CMakeLists.txt

@@ -15,7 +15,6 @@ add_qtc_library(ExtensionSystem
     pluginview.cpp pluginview.h
   EXPLICIT_MOC
     pluginmanager.h
-    pluginmanager_p.h
   SKIP_AUTOMOC pluginmanager.cpp
 )
 

src/plugins/clangformat/CMakeLists.txt

@@ -37,5 +37,4 @@ extend_qtc_plugin(ClangFormat
     tests/clangformat-test.h
   DEFINES
     TESTDATA_DIR="${CMAKE_CURRENT_SOURCE_DIR}/tests/data"
-  EXPLICIT_MOC tests/clangformat-test.h
 )

src/plugins/cppeditor/CMakeLists.txt

@@ -112,7 +112,6 @@ add_qtc_plugin(CppEditor
     wrappablelineedit.cpp wrappablelineedit.h
    EXPLICIT_MOC
      cppquickfixsettingswidget.h
-     cppquickfixprojectsettingswidget.h
 )
 
 extend_qtc_plugin(CppEditor

src/plugins/imageviewer/CMakeLists.txt

@@ -15,5 +15,4 @@ add_qtc_plugin(ImageViewer
     imageviewerplugin.cpp
     imageviewertr.h
     multiexportdialog.cpp multiexportdialog.h
-  EXPLICIT_MOC imageviewer.h
 )

src/plugins/vcpkg/CMakeLists.txt

@@ -13,5 +13,4 @@ extend_qtc_plugin(Vcpkg
   CONDITION WITH_TESTS
   SOURCES
     vcpkg_test.cpp vcpkg_test.h
-  EXPLICIT_MOC vcpkg_test.h
 )