Bash 4.2.0(1)-release, which we use during bootstrap, does not yield the
"x" case in:

  case x"$EMULATION_NAME" in x) ;; *) ;; esac

when 'EMULATION_NAME' is undefined.  Bash 4.3.30(1)-release doesn't have this
problem.  Work around it.

This Bash bug was fixed
in <http://ftp.gnu.org/gnu/bash/bash-4.2-patches/bash42-007>.

--- a/ld/emulparams/elf32bmipn32-defs.sh
+++ b/ld/emulparams/elf32bmipn32-defs.sh
@@ -13,7 +13,7 @@ LITTLE_OUTPUT_FORMAT="elf32-littlemips"
 TEMPLATE_NAME=elf32
 EXTRA_EM_FILE=mipself
 
-case x"$EMULATION_NAME" in
+case "x$EMULATION_NAME" in
 xelf32*n32*) ELFSIZE=32 ;;
 xelf64*) ELFSIZE=64 ;;
 x) ;;
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<tr><td><span title='2021-05-11 09:17:00 -0400'>2021-05-11</span></td><td><a href='/guix/commit/po/doc/guix-manual.it.po?id=a0178d34f582b50e9bdbb0403943129ae5b560ff'>nls: Update translations.</a></td><td>Maxim Cournoyer</td></tr>
<tr><td><span title='2021-05-10 22:34:43 -0400'>2021-05-10</span></td><td><a href='/guix/commit/po/doc/guix-manual.it.po?id=21fcced608c93e1ac836cdd9ab8c5d200c667e75'>nls: Update translations.</a></td><td>Maxim Cournoyer</td></tr>
<tr><td><span title='2021-04-18 13:18:20 +0200'>2021-04-18</span></td><td><a href='/guix/commit/po/doc/guix-manual.it.po?id=d2d6c20feec37e74cde839bef09de674a1196e85'>nls: Add Italian translation.</a><span class='msg-avail'>...</span></td><td>Julien Lepiller</td></tr>