* module/language/c99/compiler.mes: New file.
* module/language/c99/compiler.scm: Include it.
* module/mes/elf.mes: Move (mes-use-module) into cond-expand.
* module/mes/elf.scm: New file.
* module/mes/libc-i386.scm: New file.
* module/nyacc/lang/c99/parser.mes: Add missing module includes.
* module/nyacc/lang/util.mes: Add missing module include.
* scripts/mescc.mes: Use Nyacc.
* guile/mescc.scm: New file.
* GNUmakefile (guile-mescc): Run it.
* module/nyacc/lalr.scm: Export process-spec, reserved?. Use optargs, syncase.
* module/nyacc/lex.scm: Use optargs, syncase.
* module/nyacc/parse.scm: Use optargs.
* module/nyacc/util.scm: Use optargs.
* module/nyacc/lang/util.scm: Use optargs.
* module/nyacc/lang/c99/cpp.scm: Use syncase.
* module/nyacc/lang/c99/parser.scm: Use optargs, syncase.