Bump qtsvg version to 5.3.0

Change-Id: I706444eb0f7516bf0e714aa8504e73e38e888998
Reviewed-by: Sergio Ahumada <sergio.ahumada@digia.com>
Merge remote-tracking branch 'origin/stable' into dev

Change-Id: I80d1a402dfb6f306748e65f056d4d50cb402ee02
Merge remote-tracking branch 'origin/stable' into dev

Conflicts:
	.qmake.conf

Change-Id: I96adbf312c94e0f70ccc8d2b676155e1f79a56cb
Merge remote-tracking branch 'origin/stable' into dev

Change-Id: Iebfffe157538b0a0573e9bfbed7eeac6f53390b1
Merge remote-tracking branch 'origin/stable' into dev

Change-Id: I1acc7b8d54e8db1a3bec01c31c755032d24e8e64
Merge remote-tracking branch 'origin/stable' into dev

Conflicts:
	.qmake.conf

Change-Id: Id5bef032b66a051e3a6e707abae442ccd2610c84
Replace win32-g++ with mingw scope

Commit 773dd01 in qtbase introduced a general mingw platform scope, which
is cleaner and more flexible than matching the spec name.

(see 278152fff for a similar commit in qtbase).

Change-Id: I430ab289af99e96cd6ed6edfd683258defcb13a4
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@digia.com>