Inheriting existing environment for test suite executables Ticket #215 (Overhaul support for packages' tests).  Previously, the test runner replaced the environment for test suite executables with one containing only the datadir path for package data files.  For test suites invoking other programs, it is necessary to preserve the system paths, so the datadir path variable is appended to the inherited environment.
Inheriting existing environment for test suite executables
Ticket #215 (Overhaul support for packages' tests).  Previously, the test
runner replaced the environment for test suite executables with one containing
only the datadir path for package data files.  For test suites invoking other
programs, it is necessary to preserve the system paths, so the datadir path
variable is appended to the inherited environment.

beni55/cabal,kosmikus/cabal,thomie/cabal,ghc-android/cabal,trskop/cabal,Peaker/cabal,themoritz/cabal,seereason/cabal,anton-dessiatov/cabal,garetxe/cabal,gridaphobe/cabal,mydaum/cabal,martinvlk/cabal,randen/cabal,gbaz/cabal,anton-dessiatov/cabal,headprogrammingczar/cabal,plow-technologies/cabal,bennofs/cabal,lukexi/cabal,valderman/cabal,themoritz/cabal,mmakowski/cabal,plumlife/cabal,fugyk/cabal,mightybyte/cabal,mydaum/cabal,alphaHeavy/cabal,christiaanb/cabal,ian-ross/cabal,rimmington/cabal,x-y-z/cabal,thomie/cabal,enolan/cabal,kolmodin/cabal,thoughtpolice/cabal,corngood/cabal,kosmikus/cabal,fpco/cabal,plow-technologies/cabal,Heather/cabal,Helkafen/cabal,gbaz/cabal,valderman/cabal,mmakowski/cabal,gridaphobe/cabal,themoritz/cabal,triplepointfive/cabal,eric-stanley/cabal,christiaanb/cabal,Heather/cabal,typelead/epm,Helkafen/cabal,corngood/cabal,fpco/cabal,Peaker/cabal,headprogrammingczar/cabal,ghc-android/cabal,sopvop/cabal,sopvop/cabal,thoughtpolice/cabal,garetxe/cabal,edsko/cabal,plumlife/cabal,martinvlk/cabal,randen/cabal,eric-stanley/cabal,seereason/cabal,fugyk/cabal,enolan/cabal,edsko/cabal,kolmodin/cabal,triplepointfive/cabal,beni55/cabal,rimmington/cabal,ian-ross/cabal,lukexi/cabal,alphaHeavy/cabal,x-y-z/cabal,bennofs/cabal,trskop/cabal,typelead/epm,mightybyte/cabal,sopvop/cabal