Doc: Document CONFIG values that are worth documenting

Fixes: QTBUG-538
Change-Id: Id06e316e7ae3d59b63b256ef565a1ad6dc5d9dd2
Reviewed-by: Leena Miettinen <riitta-leena.miettinen@qt.io>

qmake/doc/src/qmake-manual.qdoc

@@ -992,6 +992,22 @@
     \row    \li embed_translations \li Embed the generated translations from
             \c lrelease in the executable, under \l{QM_FILES_RESOURCE_PREFIX}.
             Requires \c lrelease to be set, too. Not set by default.
+    \row \li create_libtool \li Create a libtool .la file for the currently
+            built library.
+    \row \li create_pc \li Create a pkg-config .pc file for the currently built
+            library.
+    \row \li no_batch \li NMake only: Turn off generation of NMake batch rules
+            or inference rules.
+    \row \li skip_target_version_ext \li Suppress the automatic version number
+            appended to the DLL file name on Windows.
+    \row \li suppress_vcproj_warnings \li Suppress warnings of the VS project
+            generator.
+    \row \li windeployqt \li Automatically invoke windeployqt after linking,
+            and add the output as deployment items.
+    \row \li dont_recurse \li Suppress qmake recursion for the current
+            subproject.
+    \row \li no_include_pwd \li Do not add the current directory to
+            INCLUDEPATHS.
     \endtable
 
     When you use the \c debug_and_release option (which is the default under
@@ -1039,6 +1055,8 @@
         qmake will process all libraries linked to
         by the application and find their meta-information (see
         \l{LibDepend}{Library Dependencies} for more info).
+     \row \li no_install_prl \li This option disables the generation of
+        installation rules for generated .prl files.
      \endtable
 
     \note The \c create_prl option is required when \e {building} a