Fix on armv6

Add patch obtained from gentoo for armv6 where qreal != float .

PR: 217424
Submitted by: Mikaël Urankar <mikael.urankar at gmail.com>
Obtained from: https://gitweb.gentoo.org/repo/gentoo.git/tree/dev-python/PyQt4/files/PyQt4-4.7.3-qreal_float_support.patch