* configure.ac: Replaced AC_OUTPUT(list...) with an AC_OUTPUT

without arguments, and AC_CONFIG_FILES listing the files.

* Makefile.in: Changed the assembler rules as suffix rules.
Rewrote the configure-related rules, mostly based on the example
in the autoconf manual.

Rev: src/nettle/ChangeLog:1.286
Rev: src/nettle/Makefile.in:1.5
Rev: src/nettle/configure.ac:1.46