Add an environment variable to python-sip that extends its search
directories for .sip files.

It seems that we cannot easily change the destination folder of these
files though, so this variable must be set on a per-package basis (and
non through search-path).

--- sip/sipbuild/builder.py	2023-03-22 09:06:37.588792878 +0100
+++ sip/sipbuild/builder.py	2023-03-22 09:10:35.830181134 +0100
@@ -254,6 +254,10 @@
                     os.path.join(project.target_dir,
                             project.get_bindings_dir()))
 
+            # Add extra bindings from environment for GNU Guix.
+            if 'SIP_INCLUDE_DIRS' in os.environ:
+                sip_include_dirs.extend(os.environ['SIP_INCLUDE_DIRS'].split(os.pathsep))
+
             # Generate the sip.h file for the shared sip module.
             copy_sip_h(abi_major_version, project.build_dir,
                     project.sip_module, version_info=project.version_info)
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<tr><td><span title='2024-07-18 10:45:35 +0800'>2024-07-18</span></td><td><a href='/guix/commit/gnu/packages/sync.scm?id=b9fcea5c06ad4e743d1f97f313c04344a3eb582e'>gnu: nextcloud-client: Fix build.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/sync.scm (nextcloud-client): Fix build.
[inputs]: Remove karchive, kconfig, kcoreaddons, kio, and kwidgetsaddons; add
karchive-5, kconfig-5, kcoreaddons-5, kio-5, and kwidgetsaddons-5.

Change-Id: I30b1003fc77c06dbfc28ddc2846dabed2cdaa2d8
</span></span></td><td>Zheng Junjie</td></tr>