Don't use QT_NO_MIMETYPE in mimetypes.pri

Instead define a proper feature for it and use qtConfig().

Change-Id: I64b1d26b2419a24d3239e9935341b7d535990dfb
Reviewed-by: Lars Knoll <lars.knoll@qt.io>
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@theqtcompany.com>

configure.json

@@ -2514,6 +2514,10 @@
                   "condition": "!features.shared" }
             ]
         },
+        "mimetype": {
+            "description": "Mimetype handling",
+            "output": [ "publicFeature", "feature" ]
+        },
         "extra_features": {
             "comment": "### remove, once qfeatures.txt is ported to the new system",
             "output": [ "extraFeatures" ]

src/corelib/mimetypes/mimetypes.pri

@@ -1,6 +1,7 @@
 # Qt core mimetype module
 
-HEADERS += \
+qtConfig(mimetype) {
+    HEADERS += \
         mimetypes/qmimedatabase.h \
         mimetypes/qmimetype.h \
         mimetypes/qmimemagicrulematcher_p.h \
@@ -11,7 +12,7 @@ HEADERS += \
         mimetypes/qmimeglobpattern_p.h \
         mimetypes/qmimeprovider_p.h
 
-SOURCES += \
+    SOURCES += \
         mimetypes/qmimedatabase.cpp \
         mimetypes/qmimetype.cpp \
         mimetypes/qmimemagicrulematcher.cpp \
@@ -20,6 +21,5 @@ SOURCES += \
         mimetypes/qmimeglobpattern.cpp \
         mimetypes/qmimeprovider.cpp
 
-!contains(DEFINES, QT_NO_MIMETYPE) {
     RESOURCES += mimetypes/mimetypes.qrc
 }