fgrep has been deprecated in favor of grep -F for a long time, and the
next grep release (3.8 or 4.0) will print a warning of fgrep is used.
Stop using fgrep so we won't see the warning.

We can't hard code grep -F here or it may break build on hosts w/o GNU
grep.  autoconf documentation contains a warning about this issue and
suggest to use AC_PROG_FGREP and $FGREP, but these are too overkill in
the specific case: there is no way "debian" could be interpreted as an
non-trivial regex, so we can use a plain grep here.

gcc/fortran/ChangeLog:

        * Make-lang.in: Use grep instead of fgrep.
---
 gcc/fortran/Make-lang.in | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/gcc/fortran/Make-lang.in b/gcc/fortran/Make-lang.in
index 1cb47cb1a52..6eb597d0ca0 100644
--- a/gcc/fortran/Make-lang.in
+++ b/gcc/fortran/Make-lang.in
@@ -278,7 +278,7 @@ $(DESTDIR)$(man1dir)/$(GFORTRAN_INSTALL_NAME)$(man1ext): 
doc/gfortran.1 \
        -chmod a-x $@
 
 fortran.uninstall:
-       if $(SHELL) -c 'install-info --version | sed 1q | fgrep -s -v -i 
debian' >/dev/null 2>&1; then \
+       if $(SHELL) -c 'install-info --version | sed 1q | grep -s -v -i debian' 
>/dev/null 2>&1; then \
          echo " install-info --delete --info-dir=$(DESTDIR)$(infodir) 
$(DESTDIR)$(infodir)/gfortran.info"; \
          install-info --delete --info-dir=$(DESTDIR)$(infodir) 
$(DESTDIR)$(infodir)/gfortran.info || : ; \
        else : ; fi; \
-- 
2.36.1


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