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This reverts commit 64ec6ec2.

PGI's compiler wants

  -module

as the flag to specify the module output directory. Sadly, this is also
a libtool argument, resulting in much sorrow.

Thus, we have to escape -module by prefixing it with -Xcompiler. Sadly
libtool is not used everywhere by automake, thus we have to remove it
again in those cases were it would be passed to the compiler and cause
sorrow there.

Sad story. But with a happy ending?

Sometimes the compiler is used with the manual_cpp wrapper, do not
invoke this for linking

Supports multiple indexes now, to be used for non-tunable 'parameters'