qt5: bump version to 5.5.0

qt5: bump version to 5.5.0

QT5BASE_EGLFS_PLATFORM_HOOKS_SOURCES is no longer useful since eglfs does not
depend on the device makespecs anymore. Instead, backends are autodetected by
configure [1]. We still need specifics include path for rpi eglfs support.

0008-forkd-disable-eventfd-for-uclibc.patch disable missing eventfd in new Qt
3rd party forkd for uClibc toolchains.

Remove patches commited in Qt mainline and update pending one

[1] https://codereview.qt-project.org/#/c/107548/

Passed test :
  - Full compilation on ARM/uClibc
  - Partialy compiled and tested on i.MX6/linaro with OpenGL backend
  - Partialy compiled but not executed for Raspberry Pi (rpi-userland)

Signed-off-by: Julien Corjon <corjon.j@ecagroup.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>