os::dlopen: Use path::findLib.
os::dlopen: Use path::findLib.

Change-Id: I2224cf88622a7e6b412b9602e5965d32141eac8b
Reviewed-on: http://gerrit.aldebaran.lan:8080/6678
Reviewed-by: cgestes <ddb78fe00abb42f91254c16a0860e38eb0781789@aldebaran-robotics.com>
Reviewed-by: dmerejkowsky <1e4b13000fa8777df4cefd2fd8215187e3deb062@aldebaran-robotics.com>
Tested-by: mnottale <e3ccf1b6558404e921a21fa09cebb1153b50ec36@aldebaran-robotics.com>

bsautron/libqi,aldebaran/libqi,vbarbaresi/libqi,aldebaran/libqi,aldebaran/libqi