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='2020-05-06 22:49:55 +0200'>2020-05-06</span></td><td><a href='/guix/commit/gnu/services/sound.scm?id=3ed94ed8c2d1d0befc99ef2740b6fb9f717207db'>services: Do not use symbolic links in PulseAudio variables.</a><span class='msg-avail'>...</span></td><td>Marius Bakke</td></tr>
<tr><td><span title='2020-01-11 18:18:51 +0100'>2020-01-11</span></td><td><a href='/guix/commit/gnu/services/sound.scm?id=f1022fbf2f16b0c9ae9fa0f8af4e61e035fec4cf'>services: Split ladspa-service-type from pulseaudio-service-type.</a><span class='msg-avail'>...</span></td><td>Leo Prikler</td></tr>
<tr><td><span title='2020-01-11 18:18:51 +0100'>2020-01-11</span></td><td><a href='/guix/commit/gnu/services/sound.scm?id=f6f918113052fe781fa7a1c4c6b666b5aa57c834'>services: pulseaudio-configuration: Set flat-volumes to no.</a><span class='msg-avail'>...</span></td><td>Leo Prikler</td></tr>
<tr><td><span title='2020-01-11 18:18:50 +0100'>2020-01-11</span></td><td><a href='/guix/commit/gnu/services/sound.scm?id=f547426200d5547268d4a4a8f51c913072fa622f'>services: Add pulseaudio-configuration.</a><span class='msg-avail'>...</span></td><td>Leo Prikler</td></tr>
<tr><td><span title='2020-01-08 10:21:45 +0300'>2020-01-08</span></td><td><a href='/guix/commit/gnu/services/sound.scm?id=a66ee82a05d8ff1ef7c5ff9ac7723cb32fc4e22a'>services: Add pulseaudio service.</a><span class='msg-avail'>...</span></td><td>Oleg Pykhalov</td></tr>