[ALPHA] Fix compressed bootp.

From Jay.Estabrook@hp.com.

The bootstrap decompressor uses some libraries built for the kernel,   
which include lib/lib.a and thus vsprintf.o, whose "vsnprintf"
contains an unresolved reference to "printk".

This is caused by Linus' changes to "vsnprintf" which will now issue a
(printk) warning message under certain conditions.

arch/alpha/boot/misc.c

@@ -205,3 +205,15 @@ decompress_kernel(void *output_start,
 /*	puts(" done, booting the kernel.\n"); */
 	return output_ptr;
 }
+
+/* dummy-up printk */
+asmlinkage int printk(const char *fmt, ...)
+{
+        va_list args;
+	long ret;
+
+        va_start(args, fmt);
+        ret = srm_printk(fmt, args);
+        va_end(args);
+	return ret;
+}