Remove legacy conditions and EGS_HOME in configure
Remove legacy conditions and EGS_HOME in configure

nrc-cnrc/EGSnrc,mchamberland/EGSnrc,crcrewso/EGSnrc,marenaud/EGSnrc,nrc-cnrc/EGSnrc,marenaud/EGSnrc,crcrewso/EGSnrc,nrc-cnrc/EGSnrc,crcrewso/EGSnrc,ftessier/EGSnrc,ftessier/EGSnrc,marenaud/EGSnrc,mchamberland/EGSnrc,crcrewso/EGSnrc,ftessier/EGSnrc,MartinMartinov/EGSnrc,MartinMartinov/EGSnrc,mchamberland/EGSnrc,MartinMartinov/EGSnrc,nrc-cnrc/EGSnrc,mchamberland/EGSnrc,crcrewso/EGSnrc,ftessier/EGSnrc,ftessier/EGSnrc,MartinMartinov/EGSnrc,mchamberland/EGSnrc,ftessier/EGSnrc,MartinMartinov/EGSnrc,marenaud/EGSnrc,marenaud/EGSnrc,marenaud/EGSnrc,mchamberland/EGSnrc,nrc-cnrc/EGSnrc