assume a module's usage if it contains a passC/passL/compile pragma w… (#23323)

…hich conveys effects beyond its module scope for C/C++
codegen(suppresses current UnusedImport warning)

Just a minor inconvenience working in the area of C/C++ integration I
guess, but here we go:

I noticed receiving ```UnusedImport``` warnings for modules having only
```passC```/```passL```/```compile``` pragmas around. I gather the
compiler cannot actually infer those modules being unused as they *may*
have consequences for the whole build process (as they did in my simple
case).

Thus, I hereby suggest adding the `sfUsed` flag to the respective module
in order to suppress the compiler's warning.

I reckon other pragmas should be put into consideration as well: I will
keep up the investigation with PR followups.

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