firefox: properly fix build without freetype-config

* fails with:
  ../../gfx/thebes/gfxFT2Utils.o: In function `gfxFT2LockedFace::GetMetrics(gfxFont::Metrics*, unsigned int*)':
  /OE/build/oe-core/tmp-eglibc/work/i586-oe-linux/firefox/10.0.11esr-r0/mozilla-esr10/gfx/thebes/gfxFT2Utils.cpp:139: undefined reference to `FT_Get_Sfnt_Table'
  /OE/build/oe-core/tmp-eglibc/work/i586-oe-linux/firefox/10.0.11esr-r0/mozilla-esr10/gfx/thebes/gfxFT2Utils.cpp:234: undefined reference to `FT_Get_Sfnt_Table'
  ../../gfx/thebes/gfxFT2Utils.o: In function `gfxFT2LockedFace::GetFontTable(unsigned int, FallibleTArray<unsigned char>&)':
  /OE/build/oe-core/tmp-eglibc/work/i586-oe-linux/firefox/10.0.11esr-r0/mozilla-esr10/gfx/thebes/gfxFT2Utils.cpp:364: undefined reference to `FT_Load_Sfnt_Table'
  /OE/build/oe-core/tmp-eglibc/work/i586-oe-linux/firefox/10.0.11esr-r0/mozilla-esr10/gfx/thebes/gfxFT2Utils.cpp:372: undefined reference to `FT_Load_Sfnt_Table'
  collect2: error: ld returned 1 exit status
  ../../config/rules.mk:1089: recipe for target 'libxul.so' failed

Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>
chromium-35*: use BFD when building for x86-64

* this doesn't fix it completely, but allows it a bit further and then
  it fails in the same spot as when building for qemux86 (or 37* version
  with gold)

  sysroots/x86_64-linux/usr/bin/x86_64-oe-linux/x86_64-oe-linux-ld.gold:
    warning: hidden symbol 'sqlite3_temp_directory' in obj/third_party/sqlite/libsqlite3.a(obj/third_party/sqlite/amalgamation/sqlite.sqlite3.o)
    is referenced by DSO
    sysroots/qemux86-64/usr/lib/../lib/libsoftokn3.so
  sysroots/x86_64-linux/usr/bin/x86_64-oe-linux/x86_64-oe-linux-ld.gold:
    error: treating warnings as errors
  collect2: error: ld returned 1 exit status

  and few more symbols like this, libsoftokn3.so is provided by system
  nss, using system sqlite3 has some issues too:
  https://code.google.com/p/chromium/issues/detail?id=22208

Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>