Doc: command line tools need not be installed separately

The compiler and other necessary parts of the tool chain are found
automatically from the Xcode installation (since Qt 5.2).

Change-Id: I74e962d16aed0ca2a0eed13b701fdfe24495702a
Reviewed-by: Jerome Pasion <jerome.pasion@digia.com>
Reviewed-by: Niels Weber <niels.weber@digia.com>
Reviewed-by: Eike Ziller <eike.ziller@digia.com>
Doc: Various fixes to Enginio related links.

-Added the other Enginio depends variables.
-Updated name of Enginio.

Task-number: QTBUG-33360
Change-Id: Ica6f7f7ba89740ac610d27e839ae08fed81ada6a
Reviewed-by: Sergio Ahumada <sahumada@blackberry.com>
Doc: Mention OpenSSL in Qt for Windows requirements

Task-number: QTBUG-37293
Change-Id: I43b08f696205e5c28bf4c53cbf383aca7227fb55
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@digia.com>
Reviewed-by: Peter Hartmann <phartmann@blackberry.com>
Reviewed-by: Sze Howe Koh <szehowe.koh@gmail.com>
Doc: Removed the instructions to build from sources

Added a link to the wiki containing instructions to build
Qt 5 for Android.

Task-number: QTBUG-37292
Change-Id: I443ea2bf6dfc2d123cd91ba039262e2b4311709c
Reviewed-by: Topi Reiniö <topi.reinio@digia.com>
Doc: List Qt Quick Dialogs on the Qt modules page.

Add a link and description to Qt Quick Dialogs module
index page.

Task-number: QTBUG-38556
Change-Id: I1be113d8386454c1e9618b37b2aa059871993fdb
Reviewed-by: Sergio Ahumada <sahumada@blackberry.com>
Reviewed-by: J-P Nurmi <jpnurmi@digia.com>
Reviewed-by: Leena Miettinen <riitta-leena.miettinen@digia.com>
Doc: Sort Enginio link alphabetically

since there is no "Qt" prefix for this module, it should go right after
Active Qt.

Change-Id: If0a72954ecdbdbc7043dae08cba33186eafec04c
Reviewed-by: Leena Miettinen <riitta-leena.miettinen@digia.com>
Doc: List more platforms on Building from Sources page

Separate building from source instructions from the getting
started documentation for Qt for iOS.

Add links to build instructions for Embedded Linux, Android, iOS,
and WinRT platforms to 'Building Qt Sources' page and update the
links on 'Qt Configure Options'.

Task-number: QTBUG-37145
Change-Id: I4e9bfbfb55dbb2f6f63e68b105987b5e587189b7
Reviewed-by: Leena Miettinen <riitta-leena.miettinen@digia.com>
Reviewed-by: Jerome Pasion <jerome.pasion@digia.com>