-ddump-minimal-imports should honour -outputdir

When enabling the -ddump-minimal-imports feature for emitting <module-name>.imports files, these files are always created in the current working directory of the ghc process, regardless of the setting of any of the following options

   Redirecting output
       -hcsuf suffix  -hidir dir  -hisuf suffix  -o filename
       -odir dir  -ohi filename   -osuf suffix  -stubdir  dir
       -dumpdir dir  -outputdir dir

Trac metadata

Trac field	Value
Version	7.0.4
Type	Bug
TypeOfFailure	OtherFailure
Priority	normal
Resolution	Unresolved
Component	Compiler
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