fbreader 0.12.1: fix QA issues and bump PR

fbreader 0.12.1: fix QA issues and bump PR

There were 2 QA issues:
  * GNU_HASH (fixed with LDFLAGS='${LDFLAGS}' in EXTRA_OEMAKE )
  * .debug included in the main package (fixed by
    FILES_${PN}-dbg += "${libdir}/zlibrary/ui/.debug/")
Both were fixed and PR was bumped.

Note that buildsys(fbreader-0.8.2a_buildsys_oe.patch is an example of them)
  patches were not ported because it built correctly without.
OE_CFLAGS='${CXXFLAGS}' was removed because without the buildsys patches,
  it doesn't have any effect.