* regex.h: Renamed to gnu-regex.h.

	* regex.h: Renamed to gnu-regex.h.
	* regex.c: Renamed to gnu-regex.c.
	* Makefile.in (POSSLIBS): Refer to gnu-regex.h and gnu-regex.c.
	(REGEX, REGEX1): Change to gnu-regex.o instead of regex.o.
	(regex.o): Renamed to gnu-regex.o; refer to gnu-regex.c.
	(irix5-nat.o, osfsolib.o, gnu-regex.o, solib.o, source.o, symtab.o):
	Likewise.
	* irix5-nat.c, osfsolib.c, gnu-regex.c, solib.c, source.c, symtab.c):
	Include "gnu-regex.h" instead of "regex.h".
	* alpha-tdep.c (in_prologue): Rename to alpha_in_prologue, to
	avoid conflicts with symtab.h.

fixes building gdb under OSF/1 4.0