fix incorrect LD_LIBRARY_PATH

dev.env

@@ -38,7 +38,7 @@ export PATH=$(prepend_path $PATH $VTROOT/bin)
 # Build will not work if this is incorrect.
 export VT_MYSQL_ROOT=${VT_MYSQL_ROOT:-/usr/local}
 
-export LD_LIBRARY_PATH=$(prepend_path $LD_LIBRARY_PATH $VT_MYSQL_ROOT/lib)
+export LD_LIBRARY_PATH=$(prepend_path $LD_LIBRARY_PATH $VT_MYSQL_ROOT/lib/mysql)
 export PKG_CONFIG_PATH=$(prepend_path $PKG_CONFIG_PATH $VTROOT/lib)
 export GOPATH=$(prepend_path $GOPATH $VTROOT)