read_cmake_cache: parse variable containing numbers too
read_cmake_cache: parse variable containing numbers too

Change-Id: Ic585196c7d2f3c6a557437075f1da62ffe29f61c
Reviewed-on: http://gerrit.aldebaran.lan:8080/9620
Reviewed-by: fmichea <e20d0674aeea681862835ac59e1fa7c309090652@aldebaran-robotics.com>
Reviewed-by: dmerejkowsky <1e4b13000fa8777df4cefd2fd8215187e3deb062@aldebaran-robotics.com>
Tested-by: dmerejkowsky <1e4b13000fa8777df4cefd2fd8215187e3deb062@aldebaran-robotics.com>

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