to make prototypes for all functions declared here.
* cplus-dem.c: Avoid declaring xmalloc and xrealloc.
* c-exp.y: Rename SIGNED, OR, and AND to avoid conflict.
* environ.c: Include <stdio.h> before defs.h. Minor cleanup.
* ieee-float.h: Use PARAMS for prototypes; make some params const.
* ieee-float.c, valarith.c: Include <stdio.h>. Lint. b*=>mem*.
* m2-exp.y: Remove unused CONST; Rename OR and AND.
* utils.c: Avoid declaring malloc and realloc. Lint.
(request_quit): Accept signal-number parameter.
in the same executable without collision (c-exp.y, m2-exp.y). Add forward
delaration of function returning pointer to shut up compiler warnings about
conversion of int to pointer (symtab.h).
* expread.y, expread.tab.c: Remove.
* parser-defs.h: New file with common declarations from expread.y.
* c-exp.y: New file with the C parser from expread.y.
* m2-exp.y: New file with the Modula-2 parser.