silence Math::BigInt error if we do not have optional GMP

Author: kdreyer-usgs

mysql-agent

@@ -35,7 +35,7 @@ use Data::Dumper;
 
 # Math::BigInt reverts to perl only
 # automatically if GMP is not installed
-use Math::BigInt lib => 'GMP';
+use Math::BigInt try => 'GMP';
 
 sub new {
    bless {}, shift;