Fix clang warning about bool to pointer conversion.

The operation is legal from C++ perspective but only for "false" as it
is guaranteed to be 0. Anyway returning 0 instead of "false" is
logical and it follows coding style used in the modified functions.

(cherry-picked from qt5 commit 50995e6936c5ca75a0a8a48c29bbbedd2cc60567)
Change-Id: Ia09758e8d28599097f5c40eb24722890508afdbc
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
Reviewed-by: Jędrzej Nowacki <jedrzej.nowacki@digia.com>
Ukrainian translation update

Tiny fixes, mostly about copyright years.

Change-Id: I9223eaabccb1ce93f1688f3512344dbcfb05aa6a
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@digia.com>
Check that 3DNow! instructions are supported before including mm3dnow.h.

Include mm3dnow.h the way we already include the (S)SSE{3,4} and AVX
instruction headers: by checking that the compiler is set to support those
instructions besides verifying that QT_HAVE_3DNOW evalues to true (which
only means the compiler supported them when the build was being configured).

This has not caused a problem in most cases so far because GCC protects its
mm3dnow.h header with an #ifdef __3dNOW__ (contrary to what it does on, say,
pmmintrin.h). clang's mm3dnow.h, on the other hand, does not have that check
and can fail if -march is set to, for example, i386 or i486.

Not backported from qt5 because qtbase because qsimd_p.h does not include
the 3DNow! headers after commit a1b30b49ef09bef2e97b9a0622bf7ad622678fee.

Change-Id: I15ab5e936c71c55f89c3f25777ab27fbd262e9cd
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
Fix jump and property changes on first move when dragging a Flickable.

Fixes a regression whereby on the first mouse move the contentItem was
moved the total distance from the touch point to where the drag
distance was exceeded. For large drag thresholds this causes a
noticeable jump.

Task-number: QTBUG-30032

(cherry picked from qtquick1 3a80424aeae19e838be03aa12a5243911ec3f020)

Change-Id: I92c119d27dc2e22203484f9ada5978697d171957
Reviewed-by: Martin Jones <martin.jones@jollamobile.com>
Reviewed-by: Alan Alpert (Personal) <416365416c@gmail.com>