Document -c in hp2hs(1)
Document -c in hp2hs(1)

This fixes #8452.

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