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='2020-11-16 11:21:42 +0100'>2020-11-16</span></td><td><a href='/guix/commit/tests/build-utils.scm?id=977eb5d023cfdf8e336f1896480eea9cef5c04e9'>Properly deal with build directories containing '~'.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2019-11-26 00:16:35 +0100'>2019-11-26</span></td><td><a href='/guix/commit/tests/build-utils.scm?id=f5698dfb87df1132ca5c73a8ed7f75f63c07669f'>tests: Avoid unnecessary use of 'mock'.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2019-11-26 00:16:35 +0100'>2019-11-26</span></td><td><a href='/guix/commit/tests/build-utils.scm?id=1d64afbdc0644a2be8bd2ad157085731e212ab74'>tests: Avoid (catch 'srfi-34 …) form.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2019-06-17 16:13:36 +0200'>2019-06-17</span></td><td><a href='/guix/commit/tests/build-utils.scm?id=45d46223f92b0933aaf9b1392a21d09eaa1e2881'>utils: Add 'invoke/quiet'.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2019-03-23 23:16:55 +0100'>2019-03-23</span></td><td><a href='/guix/commit/tests/build-utils.scm?id=8c14f7f8a7ab0722bf4c9f92fd28ae85514d564f'>Merge branch 'staging' into core-updates</a></td><td>Marius Bakke</td></tr>
<tr><td><span title='2019-03-16 18:15:13 +0100'>2019-03-16</span></td><td><a href='/guix/commit/tests/build-utils.scm?id=f0cc5e7e1e4c03af29c5d4855dc5962502c49147'>booloader: Add 'invoke/quiet'.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2019-03-16 18:15:09 +0100'>2019-03-16</span></td><td><a href='/guix/commit/tests/build-utils.scm?id=22f95e028f038cee342f455dfc55bd32b804907c'>tests: Add 'with-environment-variable'.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2019-02-08 10:26:53 +0100'>2019-02-08</span></td><td><a href='/guix/commit/tests/build-utils.scm?id=0fb9a8df429a7b9f40610ff15baaff0d8e31e8cf'>guix: Add wrap-script.</a><span class='msg-avail'>...</span></td><td>Ricardo Wurmus</td></tr>
<tr><td><span title='2016-09-07 23:59:02 +0200'>2016-09-07</span></td><td><a href='/guix/commit/tests/build-utils.scm?id=b14a8385095f6672960fb8378c6578acf1ebbf8a'>utils: 'wrap-program' produces only one wrapper file.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2016-09-02 15:39:10 +0200'>2016-09-02</span></td><td><a href='/guix/commit/tests/build-utils.scm?id=7370c021483e428a9da15cdf8693d42fe75ecc62'>tests: Test 'wrap-program' without building a package.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>