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Silence additional warnings from gcc-8

if GCC version is not determined, invent it as 2.7 as a silly default.

src/makefile.cfg: improve GCC version sepcific option selection (patch from Ozkan Sezer <[email protected]>)

Update GCC version detection

From "O.Sezer" <[email protected]>:
With gcc versions < 4.0 build of djgpp library from
the CVS fails with the following errors (tried with
gcc-3.3.6 and gcc-3.4.6). The attached patch fixes
them.

Don't fail if GCC version is not determined. GCC version determination silently fails for hystorical GCC versions (like gcc-2.95.3), but they can still be used for build.

Generate gcc.opt and gcc-l.opt according to GCC version.

Move generating gpp.opt from gcc.opt to a newly created makefile.cfg.

Move -I. -I- to gcc*.opt and replace it with -iquote . for GCC 4.X (do we
need it at all. Anyway it is not expected to harm and can be removed
easily later).