Update to BuildCraft 7.99.24.6

[tstites14]

Let me know if anything is messed up with this change, please.

[Clechay]

Assuming no changes in code itself are required it seems fine to me.
This is what changed in BC from 7.99.24.5 to 7.99.24.6, it seems to be worth testing whether EU-MJ-Engine works out of the box on 7.99.24.6 with just a version bump because changes in BC are not really related to engines or even energy at all (except for quarries).
BuildCraft/BuildCraft@7.99.24.5...7.99.24.6

[Clechay]

I've applied your changes together with #13 , compiled it (OpenJDK8 + Gradle 4.9) and everything worked just fine in following testing environment:

name	ver
minecraft.jar	1.12.2
minecraft.jar	9.42
forge-1.12.2-14.23.5.2854.jar	8.0.99.99
forge-1.12.2-14.23.5.2854.jar	14.23.5.2854
buildcraft-all-7.99.24.6.jar	7.99.24.6
CodeChickenLib-1.12.2-3.2.3.358-universal.jar	3.2.3.358
EnderStorage-1.12.2-2.4.6.137-universal.jar	2.4.6.137
industrialcraft-2-2.8.220-ex112.jar	2.8.220-ex112
EnergyControl-1.12.2-0.1.8.jar	1.12.2-0.1.8
energymeters-1.12.2-1.0.2.jar	1.0.2
EU-MJ Engine-2.7.2.jar	2.7.2
ForgeMultipart-1.12.2-2.6.2.83-universal.jar	2.6.2.83
InventoryTweaks-1.63.jar	1.63+release.109.220f184
journeymap-1.12.2-5.7.1.jar	1.12.2-5.7.1
MrTJPCore-1.12.2-2.1.4.43-universal.jar	2.1.4.43
ProjectRed-1.12.2-4.9.4.120-Base.jar	4.9.4.120
ProjectRed-1.12.2-4.9.4.120-compat.jar	1.0
ProjectRed-1.12.2-4.9.4.120-integration.jar	4.9.4.120
ProjectRed-1.12.2-4.9.4.120-lighting.jar	4.9.4.120
railcraft-12.0.0.jar	12.0.0
rsgauges-1.12.2-1.2.4.jar	1.2.4

I believe it's perfectly ok to merge.
Here is my build I've used for testing:
build of EU-MJ Engine-pr11-pr13.zip