pthread: edit finder for 64 bit support
pthread: edit finder for 64 bit support

pthreadVCE2 isn't released by sourceware on their x64 pre-built binaries

Change-Id: I9d83cb46361816a674913b7a8b318a952929a4ae
Reviewed-on: http://gerrit.aldebaran.lan/59402
Tested-by: gerrit
Reviewed-by: dmerejkowsky <1e4b13000fa8777df4cefd2fd8215187e3deb062@aldebaran-robotics.com>

aldebaran/qibuild,aldebaran/qibuild,aldebaran/qibuild,aldebaran/qibuild