Simplify dependency rules using GNU make -include.
* aclocal.m4 (DEP_INCLUDE): Delete substituted variable. * Makefile.in: Use the GNU make directive -include to include dependency .d files. Delete dependency files on make clean. * examples/Makefile.in: Likewise. * testsuite/Makefile.in: Likewise. Also use $(OBJEXT) properly. * tools/Makefile.in: Likewise. * configure.ac (dummy-dep-files): Delete these config commands.
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