Configure: ensure we get the "built by ..." line in nginx -V.

For certain compilers we embed the compiler version used to build nginx
in the binary, retrievable via 'nginx -V', e.g.

  $ ./objs/nginx -V
  ...
  built by gcc 15.2.1 20250808 (Red Hat 15.2.1-1) (GCC)
  ...

However if the CFLAGS environment variable is set this would be omitted.

This is due to the compiler specific auto/cc files not being run when
the CFLAGS environment variable is set, this is so entities can set
their own compiler flags, and thus the NGX_COMPILER variable isn't set.

Nonetheless it is a useful thing to have so re-work the auto scripts to
move the version gathering out of the individual auto/cc/$NGX_CC_NAME
files and merge them into auto/cc/name.

Link: <https://github.com/nginx/nginx/issues/878>

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