Fix MIPS assembly code to work with newer GCC, where the "=h"
constraint is no longer supported.

--- libmad/fixed.h.orig	2004-02-16 21:02:03.000000000 -0500
+++ libmad/fixed.h	2011-10-29 18:47:21.000000000 -0400
@@ -304,8 +304,8 @@
  * significant bit depends on OPT_ACCURACY via mad_f_scale64().
  */
 #  define MAD_F_MLX(hi, lo, x, y)  \
-    asm ("mult	%2,%3"  \
-	 : "=l" (lo), "=h" (hi)  \
+    asm ("mult	%2,%3\n\tmfhi  %1"  \
+	 : "=l" (lo), "=r" (hi)  \
 	 : "%r" (x), "r" (y))
 
 # if defined(HAVE_MADD_ASM)
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<tr><td><span title='2023-11-22 16:51:46 +0100'>2023-11-22</span></td><td><a href='/guix/commit/tests/read-print.scm?id=2c5fb13a0504df593b64c416d952df90fb4a5f3f'>read-print: Properly indent ‘parameterize’.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2023-09-24 02:00:00 +0200'>2023-09-24</span></td><td><a href='/guix/commit/tests/read-print.scm?id=7c861ab4f46c1239ea2da4ef7b57deb88e2b2761'>tests: read-print: Update expectations.</a><span class='msg-avail'>...</span></td><td>Tobias Geerinckx-Rice</td></tr>