[gfortran] Remove gfc_current_locus() and gfc_set_locus() (Followup to scanner rewrite)

[Tobias Schlüter]

This mechanical patch removes gfc_current_locus() and gfc_set_locus, and
replaces their uses by the global variable gfc_current_locus, formerly
named gfc_current_locus1.

This meant performing three replacements:
1. x = *gfc_current_locus () -> x = gfc_current_locus
2. x = gfc_current_locus () -> x = &gfc_current_locus
3. gfc_set_locus (x) -> gfc_current_locus = *x

All this was done with sed. Compiled and tested with no regressions on
i686-pc-linux.

- Tobi

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