add libc building to agbcc.

libc/string/bcopy.c

@@ -0,0 +1,38 @@
+/*
+FUNCTION
+	<<bcopy>>---copy memory regions
+
+ANSI_SYNOPSIS
+	#include <string.h>
+	void bcopy(const char *<[in]>, char  *<[out]>, size_t <[n]>);
+
+TRAD_SYNOPSIS
+	void bcopy(<[in]>, <[out]>, <[n]>
+	char *<[in]>;
+	char *<[out]>;
+	size_t <[n]>;
+
+DESCRIPTION
+	This function copies <[n]> bytes from the memory region
+	pointed to by <[in]> to the memory region pointed to by
+	<[out]>.
+
+	This function is implemented in term of <<memmove>>.
+
+PORTABILITY
+<<bcopy>> requires no supporting OS subroutines.
+
+QUICKREF
+	bcopy - pure
+*/
+
+#include <string.h>
+
+void
+_DEFUN (bcopy, (b1, b2, length),
+	_CONST char *b1 _AND
+	char *b2 _AND
+	size_t length)
+{
+  memmove ((_PTR) b2, (_PTR) b1, length);
+}