package/qt5base: fix compile for aarch64_be

Add patch to fix availability check for storeRGB32FromARGB32PM_neon(), only
available for arm little-endian.

Fixes:

  - http://autobuild.buildroot.net/results/ab623253a6d988f4ee03d292ee85f3455de2ea25



  .obj/qimage_conversions.o: In function `convert_generic(QImageData*, QImageData const*, QFlags<Qt::ImageConversionFlag>)':
  qimage_conversions.cpp:(.text+0x2598): undefined reference to `storeRGB32FromARGB32PM_neon(unsigned char*, unsigned int const*, int, int, QVector<unsigned int> const*, QDitherInfo*)'
  qimage_conversions.cpp:(.text+0x259c): undefined reference to `storeRGB32FromARGB32PM_neon(unsigned char*, unsigned int const*, int, int, QVector<unsigned int> const*, QDitherInfo*)'
  .obj/qimage_conversions.o: In function `convert_generic_inplace(QImageData*, QImage::Format, QFlags<Qt::ImageConversionFlag>)':
  qimage_conversions.cpp:(.text+0x28fc): undefined reference to `storeRGB32FromARGB32PM_neon(unsigned char*, unsigned int const*, int, int, QVector<unsigned int> const*, QDitherInfo*)'
  qimage_conversions.cpp:(.text+0x2900): undefined reference to `storeRGB32FromARGB32PM_neon(unsigned char*, unsigned int const*, int, int, QVector<unsigned int> const*, QDitherInfo*)'

Signed-off-by: Peter Seiderer <ps.report@gmx.net>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>