[gnumeric] Complex: MUL3 and MUL4 for convenience.

[Morten Welinder <mortenw src gnome org>]

commit 98ce0c50c940b28a2673c5ddfaa3ad9cde93ec9a
Author: Morten Welinder <terra gnome org>
Date:   Fri Feb 12 23:04:25 2016 -0500

    Complex: MUL3 and MUL4 for convenience.

 src/complex.h |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)
---
diff --git a/src/complex.h b/src/complex.h
index 6713014..a831751 100644
--- a/src/complex.h
+++ b/src/complex.h
@@ -106,6 +106,8 @@ static inline gnm_float GNM_CABS (gnm_complex c) { return gnm_complex_mod (&c);
 #define GNM_CADD(c1,c2) (gnm_complex_f2_ (gnm_complex_add, (c1), (c2)))
 #define GNM_CSUB(c1,c2) (gnm_complex_f2_ (gnm_complex_sub, (c1), (c2)))
 #define GNM_CMUL(c1,c2) (gnm_complex_f2_ (gnm_complex_mul, (c1), (c2)))
+#define GNM_CMUL3(c1,c2,c3) GNM_CMUL(GNM_CMUL(c1,c2),c3)
+#define GNM_CMUL4(c1,c2,c3,c4) GNM_CMUL(GNM_CMUL(GNM_CMUL(c1,c2),c3),c4)
 #define GNM_CDIV(c1,c2) (gnm_complex_f2_ (gnm_complex_div, (c1), (c2)))
 #define GNM_CPOW(c1,c2) (gnm_complex_f2_ (gnm_complex_pow, (c1), (c2)))