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 class='logheader'><td><span title='2018-12-14 23:32:39 +0100'>2018-12-14</span></td><td class='logsubject'><a href='/guix/commit/gnu/packages/chez.scm?id=1e0f2ae0283949ee2237ca0e6013b54acdc2b7a6'>gnu: chez-sockets: Replace texlive input with minimal texlive-union.</a></td><td>Pierre Neidhardt</td></tr>
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* gnu/packages/chez.scm (chez-sockets)[native-inputs]: Replace texlive with minimal texlive-union.


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<tr class='logheader'><td><span title='2018-12-14 23:32:39 +0100'>2018-12-14</span></td><td class='logsubject'><a href='/guix/commit/gnu/packages/chez.scm?id=bc9319f42ba2f9048c7790a0bab9cd447a18e95e'>gnu: chez-web: Replace texlive input with minimal texlive-union.</a></td><td>Pierre Neidhardt</td></tr>
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* gnu/packages/chez.scm (chez-web)[native-inputs]: Replace texlive with minimal texlive-union.


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<tr class='logheader'><td><span title='2018-12-14 23:32:38 +0100'>2018-12-14</span></td><td class='logsubject'><a href='/guix/commit/gnu/packages/chez.scm?id=13d37d840366e79dc5c616f261bcb9a552b999f1'>gnu: chez-web: Fix conflicting bootstrap phase.</a></td><td>Pierre Neidhardt</td></tr>
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* gnu/packages/chez.scm (chez-web): Fix conflicting bootstrap phase.


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<tr class='logheader'><td><span title='2018-12-14 23:32:38 +0100'>2018-12-14</span></td><td class='logsubject'><a href='/guix/commit/gnu/packages/chez.scm?id=c11f3b3d68b0311ca388f55f72a540908cf5e0f1'>gnu: chez-scheme: Replace texlive input with minimal texlive-union.</a></td><td>Pierre Neidhardt</td></tr>
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* gnu/packages/chez.scm (chez-scheme)[native-inputs]: Replace texlive with
  minimal texlive-union.


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