Fix tests again

This reverts commit aabd31b.

Author: typedrat

cabal-testsuite/PackageTests/Exec/T4049/sandbox.out

@@ -9,12 +9,4 @@ Building foreign library 'myforeignlib' for my-foreign-lib-0.1.0.0..
 Installing foreign library myforeignlib in <PATH>
 Installed my-foreign-lib-0.1.0.0
 # cabal exec
-Warning: The (v1-)exec command is a part of the legacy v1 style of cabal
-usage.
-
-Please switch to using either the new project style or the legacy v1- aliases,
-as new-style projects will become the default in the next version of
-cabal-install. Please file a bug if you cannot replicate a working v1- use
-case with the new-style commands.
-
 Hi from a foreign library! Foo has value 5678

cabal-testsuite/PackageTests/Sandbox/Reinstall/sandbox.out

@@ -10,20 +10,8 @@ Building library for q-1.0..
 Installing library in <PATH>
 Installed q-1.0
 # cabal run
-Warning: This command is a part of the legacy v1 style of cabal usage.
-                        
-Please switch to using either the new project style or the legacy v1- aliases,
-as new-style projects will become the default in the next version of
-cabal-install.
 message
 # cabal run
-Warning: The (v1-)run command is a part of the legacy v1 style of cabal usage.
-
-Please switch to using either the new project style or the legacy v1- aliases,
-as new-style projects will become the default in the next version of
-cabal-install. Please file a bug if you cannot replicate a working v1- use
-case with the new-style commands.
-
 In order, the following will be installed:
 q-1.0 (reinstall)
 message updated