[SPI-2119] Add madgraph5amc-2.9.9 to LCG_88b as madgraph5amc-2.9.9.atlas2
- Add madgraph5amc-2.9.9 to LCG_88b as madgraph5amc-2.9.9.atlas2
- The patch is copied from previous ATLAS madgraph version madgraph5amc-2.9.5.atlas2
Mention SPI-2119
Mention SPI-2119