Fix ptrace-invocation on FreeBSD.
Fix ptrace-invocation on FreeBSD.

Unlike in Linux[1] FreeBSD's ptrace does not use an enum[2].

[1] http://linux.die.net/include/sys/ptrace.h
[2] http://www.freebsd.org/cgi/man.cgi?query=ptrace

This fixes compiler errors like this one:

    /home/josteink/build/coreclr/src/pal/src/arch/i386/context.cpp:305:21: error: use of undeclared identifier '__ptrace_request'
            if (ptrace((__ptrace_request)PT_GETREGS, processId, (caddr_t) &ptrace_registers, 0) == -1)

naamunds/coreclr,russellhadley/coreclr,sejongoh/coreclr,krytarowski/coreclr,richardlford/coreclr,orthoxerox/coreclr,geertdoornbos/coreclr,ganeshran/coreclr,geertdoornbos/coreclr,parjong/coreclr,sergey-raevskiy/coreclr,jhendrixMSFT/coreclr,fernando-rodriguez/coreclr,JonHanna/coreclr,ramarag/coreclr,shahid-pk/coreclr,dpodder/coreclr,sejongoh/coreclr,wtgodbe/coreclr,sperling/coreclr,Dmitry-Me/coreclr,shahid-pk/coreclr,spoiledsport/coreclr,hseok-oh/coreclr,naamunds/coreclr,mskvortsov/coreclr,bjjones/coreclr,mocsy/coreclr,krixalis/coreclr,dkorolev/coreclr,Samana/coreclr,chaos7theory/coreclr,ragmani/coreclr,bitcrazed/coreclr,zmaruo/coreclr,Godin/coreclr,Dmitry-Me/coreclr,cydhaselton/coreclr,chaos7theory/coreclr,poizan42/coreclr,cshung/coreclr,ruben-ayrapetyan/coreclr,rartemev/coreclr,pgavlin/coreclr,ragmani/coreclr,russellhadley/coreclr,david-mitchell/coreclr,stormleoxia/coreclr,chuck-mitchell/coreclr,libengu/coreclr,fffej/coreclr,orthoxerox/coreclr,kyulee1/coreclr,fernando-rodriguez/coreclr,DasAllFolks/coreclr,neurospeech/coreclr,wtgodbe/coreclr,mokchhya/coreclr,krytarowski/coreclr,ericeil/coreclr,manu-silicon/coreclr,DickvdBrink/coreclr,JonHanna/coreclr,LLITCHEV/coreclr,MCGPPeters/coreclr,wateret/coreclr,iamjasonp/coreclr,naamunds/coreclr,misterzik/coreclr,david-mitchell/coreclr,lzcj4/coreclr,dasMulli/coreclr,dkorolev/coreclr,roncain/coreclr,yizhang82/coreclr,Lucrecious/coreclr,fernando-rodriguez/coreclr,ytechie/coreclr,GuilhermeSa/coreclr,AlfredoMS/coreclr,Djuffin/coreclr,kyulee1/coreclr,ganeshran/coreclr,cydhaselton/coreclr,fffej/coreclr,orthoxerox/coreclr,bitcrazed/coreclr,jhendrixMSFT/coreclr,parjong/coreclr,mskvortsov/coreclr,KrzysztofCwalina/coreclr,yizhang82/coreclr,YongseopKim/coreclr,ZhichengZhu/coreclr,geertdoornbos/coreclr,krixalis/coreclr,geertdoornbos/coreclr,sjsinju/coreclr,krk/coreclr,wkchoy74/coreclr,richardlford/coreclr,KrzysztofCwalina/coreclr,mokchhya/coreclr,cshung/coreclr,Dmitry-Me/coreclr,gitchomik/coreclr,hanu412/coreclr,SpotLabsNET/coreclr,stormleoxia/coreclr,apanda/coreclr,bartdesmet/coreclr,ZhichengZhu/coreclr,mmitche/coreclr,Djuffin/coreclr,dasMulli/coreclr,mskvortsov/coreclr,qiudesong/coreclr,wateret/coreclr,AlexGhiondea/coreclr,shahid-pk/coreclr,jhendrixMSFT/coreclr,fernando-rodriguez/coreclr,iamjasonp/coreclr,sagood/coreclr,ramarag/coreclr,Djuffin/coreclr,blackdwarf/coreclr,gitchomik/coreclr,misterzik/coreclr,misterzik/coreclr,krixalis/coreclr,yizhang82/coreclr,schellap/coreclr,ktos/coreclr,DasAllFolks/coreclr,KrzysztofCwalina/coreclr,sperling/coreclr,Sridhar-MS/coreclr,LLITCHEV/coreclr,qiudesong/coreclr,misterzik/coreclr,hseok-oh/coreclr,sergey-raevskiy/coreclr,krk/coreclr,ktos/coreclr,Dmitry-Me/coreclr,yeaicc/coreclr,wtgodbe/coreclr,andschwa/coreclr,cmckinsey/coreclr,gkhanna79/coreclr,yeaicc/coreclr,perfectphase/coreclr,shana/coreclr,ruben-ayrapetyan/coreclr,chuck-mitchell/coreclr,apanda/coreclr,krixalis/coreclr,schellap/coreclr,rartemev/coreclr,wtgodbe/coreclr,AlexGhiondea/coreclr,mmitche/coreclr,bartonjs/coreclr,krixalis/coreclr,stormleoxia/coreclr,botaberg/coreclr,chrishaly/coreclr,dpodder/coreclr,wkchoy74/coreclr,matthubin/coreclr,KrzysztofCwalina/coreclr,Sridhar-MS/coreclr,blackdwarf/coreclr,dkorolev/coreclr,xoofx/coreclr,AlfredoMS/coreclr,gitchomik/coreclr,LLITCHEV/coreclr,xoofx/coreclr,perfectphase/coreclr,taylorjonl/coreclr,DasAllFolks/coreclr,dpodder/coreclr,OryJuVog/coreclr,benpye/coreclr,chrishaly/coreclr,Sridhar-MS/coreclr,wkchoy74/coreclr,DasAllFolks/coreclr,martinwoodward/coreclr,sejongoh/coreclr,qiudesong/coreclr,mocsy/coreclr,SpotLabsNET/coreclr,perfectphase/coreclr,poizan42/coreclr,benpye/coreclr,ramarag/coreclr,roncain/coreclr,Alcaro/coreclr,shana/coreclr,wateret/coreclr,bitcrazed/coreclr,OryJuVog/coreclr,libengu/coreclr,andschwa/coreclr,xoofx/coreclr,russellhadley/coreclr,fernando-rodriguez/coreclr,OryJuVog/coreclr,mmitche/coreclr,jakesays/coreclr,hanu412/coreclr,ktos/coreclr,orthoxerox/coreclr,dasMulli/coreclr,KrzysztofCwalina/coreclr,blackdwarf/coreclr,MCGPPeters/coreclr,shana/coreclr,poizan42/coreclr,Samana/coreclr,cmckinsey/coreclr,GuilhermeSa/coreclr,bartdesmet/coreclr,yeaicc/coreclr,zmaruo/coreclr,Sridhar-MS/coreclr,cmckinsey/coreclr,OryJuVog/coreclr,jamesqo/coreclr,roncain/coreclr,tijoytom/coreclr,Godin/coreclr,AlexGhiondea/coreclr,benpye/coreclr,geertdoornbos/coreclr,richardlford/coreclr,alexperovich/coreclr,krytarowski/coreclr,yeaicc/coreclr,perfectphase/coreclr,zmaruo/coreclr,bartdesmet/coreclr,sagood/coreclr,matthubin/coreclr,gkhanna79/coreclr,gitchomik/coreclr,blackdwarf/coreclr,libengu/coreclr,sjsinju/coreclr,neurospeech/coreclr,fieryorc/coreclr,naamunds/coreclr,SpotLabsNET/coreclr,misterzik/coreclr,libengu/coreclr,ktos/coreclr,manu-silicon/coreclr,ruben-ayrapetyan/coreclr,JonHanna/coreclr,LLITCHEV/coreclr,ganeshran/coreclr,dkorolev/coreclr,botaberg/coreclr,vinnyrom/coreclr,andschwa/coreclr,sjsinju/coreclr,xoofx/coreclr,bartonjs/coreclr,swgillespie/coreclr,jamesqo/coreclr,LLITCHEV/coreclr,bartdesmet/coreclr,chaos7theory/coreclr,bitcrazed/coreclr,ra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