Skip tests that rely on the `amhello' tarball that comes with Automake.
That tarball's `configure' uses #!/bin/sh, but we can't easily patch it.

diff --git a/t/amhello-binpkg.sh b/t/amhello-binpkg.sh
index fa88cc6..d988cee 100755
--- a/t/amhello-binpkg.sh
+++ b/t/amhello-binpkg.sh
@@ -17,6 +17,7 @@
 # Test an example from the manual about the 'amhello' package:
 # using DESTDIR to build simple, no-frills binary packages.
 
+exit 77
 am_create_testdir=empty
 . ./defs || exit 1
 
diff --git a/t/amhello-cflags.sh b/t/amhello-cflags.sh
index 666011f..2a95e3c 100755
--- a/t/amhello-cflags.sh
+++ b/t/amhello-cflags.sh
@@ -18,6 +18,7 @@
 # using VPATH builds to configure the same package with different
 # options.
 
+exit 77
 am_create_testdir=empty
 required=gcc
 . ./defs || exit 1
diff --git a/t/amhello-cross-compile.sh b/t/amhello-cross-compile.sh
index 708abda..2ee4292 100755
--- a/t/amhello-cross-compile.sh
+++ b/t/amhello-cross-compile.sh
@@ -17,6 +17,7 @@
 # Test an example from the manual about the 'amhello' package:
 # cross-compiling a package from Linux/Unix to MinGW.
 
+exit 77
 am_create_testdir=empty
 required=i586-mingw32msvc-gcc
 . ./defs || exit 1
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<tr><td><span title='2024-06-03 00:27:12 +0200'>2024-06-03</span></td><td><a href='/guix/commit/po/packages?id=834a4195241806784d4b321b95f06d85f458ce18'>nls: Update translations.</a><span class='msg-avail'>...</span></td><td>Florian Pelz</td></tr>
<tr><td><span title='2024-05-01 02:42:54 +0200'>2024-05-01</span></td><td><a href='/guix/commit/po/packages?id=8bf41c80ef13ea57e834f4e23d649bd99a3e08fc'>nls: Update translations.</a><span class='msg-avail'>...</span></td><td>Florian Pelz</td></tr>
<tr><td><span title='2024-04-14 10:29:11 +0200'>2024-04-14</span></td><td><a href='/guix/commit/po/packages?id=6c63c366776643e5831c50a2b7e29bad93273327'>maint: Use xgettext.scm wrapper to create .PO files reproducibly.</a><span class='msg-avail'>...</span></td><td>Janneke Nieuwenhuizen</td></tr>
<tr><td><span title='2024-04-01 14:09:20 +0200'>2024-04-01</span></td><td><a href='/guix/commit/po/packages?id=fa98837b1d9586b9ca7bf77dae22c3bde0fc59b5'>nls: Update translations.</a><span class='msg-avail'>...</span></td><td>Florian Pelz</td></tr>
<tr><td><span title='2024-02-29 22:57:09 +0100'>2024-02-29</span></td><td><a href='/guix/commit/po/packages?id=956f44b931f050fbffca51737000b9049808b3ca'>nls: Update translations.</a><span class='msg-avail'>...</span></td><td>Florian Pelz</td></tr>
<tr><td><span title='2024-02-01 18:34:22 +0100'>2024-02-01</span></td><td><a href='/guix/commit/po/packages?id=6f78803b01d416ab421ba860751b764b9e4f33db'>nls: Update translations.</a><span class='msg-avail'>...</span></td><td>Florian Pelz</td></tr>
<tr><td><span title='2023-10-31 23:01:37 +0100'>2023-10-31</span></td><td><a href='/guix/commit/po/packages?id=938a47c86d7bea785f33f42834c5c1f3dfa594b0'>nls: Update translations.</a><span class='msg-avail'>...</span></td><td>Florian Pelz</td></tr>
<tr><td><span title='2023-08-31 21:36:03 +0200'>2023-08-31</span></td><td><a href='/guix/commit/po/packages?id=57ab9536db20f98a36aeb25972137fbd752686cc'>nls: Update translations.</a></td><td>Florian Pelz</td></tr>
<tr><td><span title='2023-07-31 21:08:46 +0200'>2023-07-31</span></td><td><a href='/guix/commit/po/packages?id=39fbc041f92489ec30075a85937c8a38723752dc'>nls: Update translations.</a></td><td>Florian Pelz</td></tr>
<tr><td><span title='2023-06-30 14:26:07 +0200'>2023-06-30</span></td><td><a href='/guix/commit/po/packages?id=8af22b493199a17f46351c2f3d9f6ee759e48564'>nls: Update translations.</a><span class='msg-avail'>...</span></td><td>Florian Pelz</td></tr>
<tr><td><span title='2023-05-31 17:23:21 +0200'>2023-05-31</span></td><td><a href='/guix/commit/po/packages?id=8e9e6a6482f3ba98d1cdcad344ee488e8751fee7'>nls: Update translations.</a><span class='msg-avail'>...</span></td><td>Florian Pelz</td></tr>
<tr><td><span title='2023-03-07 21:14:57 +0100'>2023-03-07</span></td><td><a href='/guix/commit/po/packages?id=d333958763b0840c4cd895601b079b68358a6a46'>nls: Update translations.</a></td><td>Julien Lepiller</td></tr>
<tr><td><span title='2023-02-26 01:00:00 +0100'>2023-02-26</span></td><td><a href='/guix/commit/po/packages?id=4775460ba9a60c3c09966216da10686a70b8fadb'>nls: Fix more Texinfo Italiano.</a><span class='msg-avail'>...</span></td><td>Tobias Geerinckx-Rice</td></tr>
<tr><td><span title='2023-02-03 18:58:09 +0100'>2023-02-03</span></td><td><a href='/guix/commit/po/packages?id=b5a3e745f9f30899655aa15144c248e0292e8b1c'>gnu: Remove key-mon.scm.</a><span class='msg-avail'>...</span></td><td>Julien Lepiller</td></tr>
<tr><td><span title='2023-01-05 08:14:55 +0100'>2023-01-05</span></td><td><a href='/guix/commit/po/packages?id=dc7eb6f07ae982b4c9d083cfb10f72cb031c0424'>nls: Update translations.</a><span class='msg-avail'>...</span></td><td>Julien Lepiller</td></tr>
<tr><td><span title='2022-12-04 22:25:23 +0100'>2022-12-04</span></td><td><a href='/guix/commit/po/packages?id=2e75b328b6bbdadbffe5b643a4891b5026a0defd'>nls: Update translations.</a><span class='msg-avail'>...</span></td><td>Julien Lepiller</td></tr>