Revert much of previous erroneous checkin. Add ChangeLog entry.

* pinfo.h: Correctly set __SIGOFFSET.
* path.cc (hash_path_name): Avoid calling library functions for simple copying
of characters.
* shortcut.c: Use WIN32_LEAN_AND_MEAN.
* smallprint.c: Ditto.
* environ.cc (getwinenv): Minor clarity fix.
* localtime.c: No need to include windows.h
* string.h: New file.

winsup/cygwin/string.h

@@ -0,0 +1,44 @@
+/* string.h: Extra string defs
+
+   Copyright 2001 Red Hat, Inc.
+
+This file is part of Cygwin.
+
+This software is a copyrighted work licensed under the terms of the
+Cygwin license.  Please consult the file "CYGWIN_LICENSE" for
+details. */
+
+#ifndef _CYGWIN_STRING_H
+#define _CYGWIN_STRING_H
+
+#include_next <string.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#undef strchr
+#define strchr cygwin_strchr
+extern inline __stdcall char *
+strchr (const char *s, int c)
+{
+  register char * res;
+  __asm__ __volatile__ ("
+		movb	%%al,%%ah\n\
+	1:	movb	(%1),%%al\n\
+		cmpb	%%ah,%%al\n\
+		je	2f\n\
+		incl	%1\n\
+		testb	%%al,%%al\n\
+		jne	1b\n\
+		xorl	%1,%1\n\
+	2:	movl	%1,%0\n\
+	":"=a" (__res), "=r" (s)
+	:"0" (c), "1" (s));
+  return res;
+}
+
+#ifdef __cplusplus
+}
+#endif
+#endif /* _CYGWIN_STRING_H */