automake warnings

[Ben Pfaff]

There are some new warnings from Automake in the latest master branch:

checking whether the C compiler works... Windows/automake.mk:26:
warning: shell echo $(LDFLAGS) | sed -e 's/^-L//' -e 's|/lib$$||':
non-POSIX variable name
Windows/automake.mk:26: (probably a GNU make extension)
Makefile.am:91:   'Windows/automake.mk' included from here
Windows/automake.mk:27: warning: dir ${shell $(CC)
-print-libgcc-file-name: non-POSIX variable name
Windows/automake.mk:27: (probably a GNU make extension)
Makefile.am:91:   'Windows/automake.mk' included from here

Maybe some other method should be used to collect this information.