Linux: replaced getopt in ms5611_linux.cpp
Linux: replaced getopt in ms5611_linux.cpp

ms5611 uses getopt to parse args but the static variable
optind was not being properly updated.

Replaced use of external getopt call with simple parser;

Signed-off-by: Mark Charlebois <f1891e7fc976ae1bd489627e2954fb730751d728@gmail.com>

dagar/Firmware,mje-nz/PX4-Firmware,acfloria/Firmware,jlecoeur/Firmware,mcgill-robotics/Firmware,darknight-007/Firmware,acfloria/Firmware,dagar/Firmware,mje-nz/PX4-Firmware,jlecoeur/Firmware,mje-nz/PX4-Firmware,PX4/Firmware,krbeverx/Firmware,mcgill-robotics/Firmware,dagar/Firmware,jlecoeur/Firmware,krbeverx/Firmware,krbeverx/Firmware,krbeverx/Firmware,Aerotenna/Firmware,Aerotenna/Firmware,acfloria/Firmware,jlecoeur/Firmware,acfloria/Firmware,Aerotenna/Firmware,acfloria/Firmware,jlecoeur/Firmware,PX4/Firmware,dagar/Firmware,acfloria/Firmware,Aerotenna/Firmware,mje-nz/PX4-Firmware,krbeverx/Firmware,darknight-007/Firmware,mcgill-robotics/Firmware,dagar/Firmware,mcgill-robotics/Firmware,mje-nz/PX4-Firmware,jlecoeur/Firmware,mcgill-robotics/Firmware,darknight-007/Firmware,mje-nz/PX4-Firmware,Aerotenna/Firmware,darknight-007/Firmware,darknight-007/Firmware,PX4/Firmware,acfloria/Firmware,mje-nz/PX4-Firmware,PX4/Firmware,dagar/Firmware,PX4/Firmware,krbeverx/Firmware,PX4/Firmware,mcgill-robotics/Firmware,jlecoeur/Firmware,jlecoeur/Firmware,krbeverx/Firmware,Aerotenna/Firmware,mcgill-robotics/Firmware,Aerotenna/Firmware,PX4/Firmware,dagar/Firmware