The patch fixes build failure of form:
     ../src/alpha/osf.S:298:2: error: #error "osf.S out of sync with ffi.h"
Upstream fixed the bug in a more invasive way
but didn't have releases since 3.2.1.

The patch is taken from Gentoo:
https://gitweb.gentoo.org/repo/gentoo.git/tree/dev-libs/libffi/files/libffi-3.2.1-complex_alpha.patch

--- libffi-3.2.1/src/alpha/osf.S	2015-01-16 10:46:15.000000000 +0100
+++ libffi-3.2.1/src/alpha/osf.S	2015-01-16 10:46:24.000000000 +0100
@@ -279,6 +279,7 @@
 	.gprel32 $load_64	# FFI_TYPE_SINT64
 	.gprel32 $load_none	# FFI_TYPE_STRUCT
 	.gprel32 $load_64	# FFI_TYPE_POINTER
+	.gprel32 $load_none	# FFI_TYPE_COMPLEX
 
 /* Assert that the table above is in sync with ffi.h.  */
 
@@ -294,7 +295,8 @@
 	|| FFI_TYPE_SINT64 != 12	\
 	|| FFI_TYPE_STRUCT != 13	\
 	|| FFI_TYPE_POINTER != 14	\
-	|| FFI_TYPE_LAST != 14
+	|| FFI_TYPE_COMPLEX != 15       \
+	|| FFI_TYPE_LAST != 15
 #error "osf.S out of sync with ffi.h"
 #endif
 
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<tr class='logheader'><td><span title='2024-07-18 18:28:25 +0800'>2024-07-18</span></td><td class='logsubject'><a href='/guix/commit/gnu/packages/php.scm?id=557102d36c8a4b815431dc7b4cbe913744eeaeb3'>gnu: php: Update to 8.3.9.</a></td><td>Wilko Meyer</td></tr>
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* gnu/packages/php.scm (php): Update to 8.3.9.

Change-Id: Icdd41fff7fd89dd0116988acb0f7aa28c2e77ebe
Signed-off-by: Zheng Junjie &lt;zhengjunjie@iscas.ac.cn&gt;


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<tr class='logheader'><td><span title='2024-06-29 12:06:29 +0800'>2024-06-29</span></td><td class='logsubject'><a href='/guix/commit/gnu/packages/php.scm?id=b5dea86d6411de36a3b7b1c5a0a13a22306a0554'>gnu: php: Update to 8.3.8.</a></td><td>Wilko Meyer</td></tr>
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* gnu/packages/php.scm (php): Update to 8.3.8.

Change-Id: Ia0714520973b537a82d12fb346f3efbadfc11e61
Signed-off-by: Zheng Junjie &lt;zhengjunjie@iscas.ac.cn&gt;


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<tr class='logheader'><td><span title='2024-04-26 16:48:58 +0100'>2024-04-26</span></td><td class='logsubject'><a href='/guix/commit/gnu/packages/php.scm?id=d2a1a4efad4f1ee5b92320bdd7146411184652f9'>gnu: php: Update to 8.3.6.</a></td><td>Wilko Meyer</td></tr>
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* gnu/packages/php.scm (php): Update to 8.3.6.

Change-Id: I8f173558fc4098d6d72b42724e5e106d7dabb62a
Signed-off-by: Christopher Baines &lt;mail@cbaines.net&gt;


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<tr class='logheader'><td><span title='2023-11-28 11:53:40 +0200'>2023-11-28</span></td><td class='logsubject'><a href='/guix/commit/gnu/packages/php.scm?id=62376e3eb67644454bc655bed56be4be965bd13e'>gnu: php: Skip some tests on powerpc-linux.</a></td><td>Efraim Flashner</td></tr>
<tr class='nohover-highlight'><td/><td colspan='3' class='logmsg'>
* gnu/packages/php.scm (php)[arguments]: Adjust the 'prepare-tests phase
to skip some failing tests when building for powerpc-linux.

Change-Id: I6dd496c8b6851a06386049dca6aa0e2273e4029e


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<tr class='logheader'><td><span title='2023-11-27 13:19:00 +0200'>2023-11-27</span></td><td class='logsubject'><a href='/guix/commit/gnu/packages/php.scm?id=f5493629e2650c0d30caf0f01f76b2383f78b9de'>gnu: php: Add another test to the skip-test list.</a></td><td>Efraim Flashner</td></tr>
<tr class='nohover-highlight'><td/><td colspan='3' class='logmsg'>
* gnu/packages/php.scm (php)[arguments]: Add a test which fails on
multiple architectures to the list skipped by all architectures.

Change-Id: I3c55179381ff4cf3e22db5d3ededf60d2a3d9d73


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<tr class='logheader'><td><span title='2023-11-27 11:59:36 +0200'>2023-11-27</span></td><td class='logsubject'><a href='/guix/commit/gnu/packages/php.scm?id=a8df11fa6c3cce36c8e2ada72b7f6d03f5a35123'>gnu: php: Combine skipped tests per arch code.</a></td><td>Efraim Flashner</td></tr>
<tr class='nohover-highlight'><td/><td colspan='3' class='logmsg'>
* gnu/packages/php.scm (php)[arguments]: In 'prepare-tests phase combine
the code used for skipping a few tests per architecture into one
grouping.

Change-Id: I275099dcc2b1f003ec48a72b910d4cfd579d9628


</td></tr>
<tr class='logheader'><td><span title='2023-11-27 11:15:20 +0200'>2023-11-27</span></td><td class='logsubject'><a href='/guix/commit/gnu/packages/php.scm?id=0bef0ac46ec70e437daeea471563fbba7ac27acc'>gnu: php: Update to 8.2.13.</a></td><td>Efraim Flashner</td></tr>
<tr class='nohover-highlight'><td/><td colspan='3' class='logmsg'>
* gnu/packages/php.scm (php): Update to 8.2.13.
[source]: Remove patch.
[arguments]: Adjust the 'prepare-tests phase to skip fewer tests.
[inputs]: Replace openssl-1.1 with openssl.
* gnu/packages/patches/php-fix-streams-copy-length.patch: Remove file.
* gnu/local.mk (dist_patch_DATA): Remove it.

Change-Id: I29892deda457fdbaa6dd5e01515e97583951836d


</td></tr>
 Export image? procedure.</a><span class='msg-avail'>...</span></td><td>Mathieu Othacehe</td></tr>
<tr><td><span title='2020-09-30 10:47:59 +0200'>2020-09-30</span></td><td><a href='/guix/commit/gnu/image.scm?id=99d036ce8402326352c8aa181d89c6d0c7ce85a8'>image: Add image-type support.</a><span class='msg-avail'>...</span></td><td>Mathieu Othacehe</td></tr>