Add package config for our custom ghc-prim.
Add package config for our custom ghc-prim.

jtojnar/haste-compiler,nyson/haste-compiler,beni55/haste-compiler,jtojnar/haste-compiler,szatkus/haste-compiler,joelburget/haste-compiler,crodjer/haste-compiler,nyson/haste-compiler,szatkus/haste-compiler,santolucito/haste-compiler,joelburget/haste-compiler,nyson/haste-compiler,crodjer/haste-compiler,akru/haste-compiler,jtojnar/haste-compiler,crodjer/haste-compiler,crodjer/haste-compiler,akru/haste-compiler,joelburget/haste-compiler,kranich/haste-compiler,kranich/haste-compiler,joelburget/haste-compiler,kranich/haste-compiler,akru/haste-compiler,nyson/haste-compiler,szatkus/haste-compiler,beni55/haste-compiler,santolucito/haste-compiler,santolucito/haste-compiler,akru/haste-compiler,beni55/haste-compiler,szatkus/haste-compiler,kranich/haste-compiler,akru/haste-compiler,crodjer/haste-compiler,santolucito/haste-compiler,beni55/haste-compiler,jtojnar/haste-compiler