Avoid testsuite failures due to Autoconf Fortran change

[Ralf Wildenhues]

My recent Autoconf change provoked some testsuite failures in Automake,
see <http://hydra.nixos.org/build/856303/log/raw>.  I'm pushing the fix
below to maint and merging to branch-1.11 and master.

Cheers,
Ralf

    Avoid testsuite failures due to Autoconf Fortran change.
    
    Autoconf v2.68-21-g727ce95 causes AC_F77_LIBRARY_LDFLAGS to
    require computing the canonical host name.  Ensure config.guess
    and config.sub files are present for respective checks.
    
    * tests/compile_f_c_cxx.test: Add stub files.
    * tests/flibs.test: Likewise.
    * tests/fort4.test: Use $AUTOMAKE -a for installing files.

diff --git a/tests/compile_f_c_cxx.test b/tests/compile_f_c_cxx.test
index a995527..d1836fb 100755
--- a/tests/compile_f_c_cxx.test
+++ b/tests/compile_f_c_cxx.test
@@ -39,6 +39,8 @@ END
 : > foo.f
 : > bar.c
 : > baz.cc
+: > config.guess
+: > config.sub
 
 $ACLOCAL
 $AUTOMAKE
diff --git a/tests/flibs.test b/tests/flibs.test
index b9fe541..d35c4c6 100755
--- a/tests/flibs.test
+++ b/tests/flibs.test
@@ -48,6 +48,8 @@ zardoz_LDADD = @FLIBS@
 END
 
 : > zardoz.f
+: > config.guess
+: > config.sub
 
 $ACLOCAL
 $AUTOMAKE
diff --git a/tests/fort4.test b/tests/fort4.test
index b928a61..84df399 100755
--- a/tests/fort4.test
+++ b/tests/fort4.test
@@ -67,7 +67,7 @@ LDADD = $(FCLIBS)
 END
 
 $ACLOCAL
-$AUTOMAKE
+$AUTOMAKE -a
 # The Fortran 77 linker should be preferred:
 grep '.\$(FCLINK)' Makefile.in && Exit 1