make tests compile with gcc 4.6, relates to #157
make tests compile with gcc 4.6, relates to #157

StalderT/open62541,JGrothoff/open62541,jpfr/open62541,jpfr/open62541,bostjanv/open62541,JGrothoff/open62541,StalderT/open62541,StalderT/open62541,open62541/open62541,JGrothoff/open62541,StalderT/open62541,open62541/open62541,AGIsmail/open62541,JGrothoff/open62541,bostjanv/open62541,jpfr/open62541,open62541/open62541,open62541/open62541,AGIsmail/open62541,jpfr/open62541