Remove obsolete declarations from `MiscClosures.h`
Remove obsolete declarations from `MiscClosures.h`

When `integer-gmp` was moved out of the RTS
(via 1b61c2db6a8d6627577bcd7876474a0c5bd1eedb)
these declarations were missed.

Signed-off-by: Herbert Valerio Riedel <202fbcf3c00694524024feb79f3bb8fc1c4e4f9c@gnu.org>

sdiehl/ghc,snoyberg/ghc,da-x/ghc,lukexi/ghc-7.8-arm64,holzensp/ghc,vTurbine/ghc,olsner/ghc,hferreiro/replay,mcschroeder/ghc,mcschroeder/ghc,ml9951/ghc,wxwxwwxxx/ghc,green-haskell/ghc,GaloisInc/halvm-ghc,snoyberg/ghc,urbanslug/ghc,mcschroeder/ghc,frantisekfarka/ghc-dsi,TomMD/ghc,AlexanderPankiv/ghc,hferreiro/replay,acowley/ghc,tibbe/ghc,da-x/ghc,christiaanb/ghc,mfine/ghc,mettekou/ghc,mcschroeder/ghc,sgillespie/ghc,acowley/ghc,gridaphobe/ghc,nushio3/ghc,olsner/ghc,holzensp/ghc,ryantm/ghc,mettekou/ghc,sgillespie/ghc,da-x/ghc,christiaanb/ghc,forked-upstream-packages-for-ghcjs/ghc,anton-dessiatov/ghc,spacekitteh/smcghc,forked-upstream-packages-for-ghcjs/ghc,TomMD/ghc,olsner/ghc,oldmanmike/ghc,nathyong/microghc-ghc,vikraman/ghc,nkaretnikov/ghc,TomMD/ghc,urbanslug/ghc,jstolarek/ghc,ghc-android/ghc,vikraman/ghc,gcampax/ghc,nkaretnikov/ghc,anton-dessiatov/ghc,nushio3/ghc,mcschroeder/ghc,nathyong/microghc-ghc,bitemyapp/ghc,elieux/ghc,fmthoma/ghc,nkaretnikov/ghc,lukexi/ghc,ml9951/ghc,shlevy/ghc,ghc-android/ghc,christiaanb/ghc,anton-dessiatov/ghc,tjakway/ghcjvm,AlexanderPankiv/ghc,gridaphobe/ghc,spacekitteh/smcghc,da-x/ghc,hferreiro/replay,urbanslug/ghc,anton-dessiatov/ghc,mfine/ghc,oldmanmike/ghc,mettekou/ghc,acowley/ghc,nushio3/ghc,elieux/ghc,mfine/ghc,ghc-android/ghc,christiaanb/ghc,fmthoma/ghc,oldmanmike/ghc,ghc-android/ghc,TomMD/ghc,anton-dessiatov/ghc,gridaphobe/ghc,lukexi/ghc,forked-upstream-packages-for-ghcjs/ghc,GaloisInc/halvm-ghc,snoyberg/ghc,gridaphobe/ghc,mettekou/ghc,hferreiro/replay,wxwxwwxxx/ghc,lukexi/ghc-7.8-arm64,olsner/ghc,frantisekfarka/ghc-dsi,nkaretnikov/ghc,elieux/ghc,mettekou/ghc,gcampax/ghc,siddhanathan/ghc,bitemyapp/ghc,tjakway/ghcjvm,TomMD/ghc,nushio3/ghc,ryantm/ghc,nkaretnikov/ghc,holzensp/ghc,bitemyapp/ghc,gcampax/ghc,green-haskell/ghc,nathyong/microghc-ghc,da-x/ghc,bitemyapp/ghc,elieux/ghc,siddhanathan/ghc,ezyang/ghc,urbanslug/ghc,acowley/ghc,snoyberg/ghc,snoyberg/ghc,mettekou/ghc,sdiehl/ghc,gridaphobe/ghc,ml9951/ghc,sgillespie/ghc,GaloisInc/halvm-ghc,lukexi/ghc-7.8-arm64,AlexanderPankiv/ghc,anton-dessiatov/ghc,ml9951/ghc,ryantm/ghc,oldmanmike/ghc,sdiehl/ghc,oldmanmike/ghc,snoyberg/ghc,jstolarek/ghc,forked-upstream-packages-for-ghcjs/ghc,christiaanb/ghc,tjakway/ghcjvm,tibbe/ghc,mfine/ghc,wxwxwwxxx/ghc,ezyang/ghc,sgillespie/ghc,sgillespie/ghc,jstolarek/ghc,mcschroeder/ghc,green-haskell/ghc,nathyong/microghc-ghc,gcampax/ghc,shlevy/ghc,nathyong/microghc-ghc,tjakway/ghcjvm,da-x/ghc,lukexi/ghc-7.8-arm64,GaloisInc/halvm-ghc,spacekitteh/smcghc,ezyang/ghc,ghc-android/ghc,fmthoma/ghc,ml9951/ghc,ghc-android/ghc,nushio3/ghc,fmthoma/ghc,lukexi/ghc,AlexanderPankiv/ghc,mfine/ghc,sdiehl/ghc,AlexanderPankiv/ghc,frantisekfarka/ghc-dsi,hferreiro/replay,oldmanmike/ghc,green-haskell/ghc,green-haskell/ghc,olsner/ghc,jstolarek/ghc,fmthoma/ghc,tjakway/ghcjvm,ezyang/ghc,vTurbine/ghc,forked-upstream-packages-for-ghcjs/ghc,snoyberg/ghc,anton-dessiatov/ghc,AlexanderPankiv/ghc,siddhanathan/ghc,tibbe/ghc,TomMD/ghc,ml9951/ghc,spacekitteh/smcghc,mettekou/ghc,vikraman/ghc,GaloisInc/halvm-ghc,mfine/ghc,elieux/ghc,tjakway/ghcjvm,mfine/ghc,sdiehl/ghc,acowley/ghc,gcampax/ghc,urbanslug/ghc,christiaanb/ghc,da-x/ghc,sdiehl/ghc,nathyong/microghc-ghc,elieux/ghc,holzensp/ghc,ryantm/ghc,spacekitteh/smcghc,ghc-android/ghc,TomMD/ghc,ml9951/ghc,vTurbine/ghc,sgillespie/ghc,forked-upstream-packages-for-ghcjs/ghc,christiaanb/ghc,shlevy/ghc,frantisekfarka/ghc-dsi,olsner/ghc,nushio3/ghc,urbanslug/ghc,lukexi/ghc,acowley/ghc,vTurbine/ghc,shlevy/ghc,siddhanathan/ghc,gcampax/ghc,siddhanathan/ghc,vikraman/ghc,ryantm/ghc,sdiehl/ghc,nushio3/ghc,ezyang/ghc,fmthoma/ghc,GaloisInc/halvm-ghc,jstolarek/ghc,ezyang/ghc,vikraman/ghc,gridaphobe/ghc,shlevy/ghc,nathyong/microghc-ghc,ml9951/ghc,vTurbine/ghc,bitemyapp/ghc,shlevy/ghc,wxwxwwxxx/ghc,tjakway/ghcjvm,lukexi/ghc-7.8-arm64,elieux/ghc,gridaphobe/ghc,holzensp/ghc,gcampax/ghc,siddhanathan/ghc,acowley/ghc,nkaretnikov/ghc,vikraman/ghc,shlevy/ghc,wxwxwwxxx/ghc,AlexanderPankiv/ghc,nkaretnikov/ghc,urbanslug/ghc,hferreiro/replay,vTurbine/ghc,siddhanathan/ghc,vikraman/ghc,fmthoma/ghc,oldmanmike/ghc,wxwxwwxxx/ghc,lukexi/ghc,tibbe/ghc,GaloisInc/halvm-ghc,forked-upstream-packages-for-ghcjs/ghc,frantisekfarka/ghc-dsi,ezyang/ghc,tibbe/ghc,sgillespie/ghc,wxwxwwxxx/ghc,olsner/ghc,vTurbine/ghc,hferreiro/replay,mcschroeder/ghc