error.h: add prototypes for nasm_note[f]()

Apparently -Wall -W doesn't enable -Wmissing-prototypes for some
bizarre reason.

This allowed this to slink through unnoticed.

Signed-off-by: H. Peter Anvin <hpa@zytor.com>

include/error.h

diff --git a/include/error.h b/include/error.h
index d01c4ca..bd8b295 100644
--- a/include/error.h
+++ b/include/error.h
@@ -60,6 +60,8 @@
 void printf_func(2, 3) nasm_debugf(errflags flags, const char *fmt, ...);
 void printf_func(1, 2) nasm_info(const char *fmt, ...);
 void printf_func(2, 3) nasm_infof(errflags flags, const char *fmt, ...);
+void printf_func(1, 2) nasm_note(const char *fmt, ...);
+void printf_func(2, 3) nasm_notef(errflags flags, const char *fmt, ...);
 void printf_func(2, 3) nasm_warn_(errflags flags, const char *fmt, ...);
 void printf_func(1, 2) nasm_nonfatal(const char *fmt, ...);
 void printf_func(2, 3) nasm_nonfatalf(errflags flags, const char *fmt, ...);