Fix esan compilation against glibc 2.26:

  /tmp/guix-build-clang-runtime-3.9.1.drv-0/compiler-rt-3.9.1.src/lib/esan/esan_sideline_linux.cpp: In static member function ‘static int __esan::SidelineThread::runSideline(void*)’:
  /tmp/guix-build-clang-runtime-3.9.1.drv-0/compiler-rt-3.9.1.src/lib/esan/esan_sideline_linux.cpp:73:22: error: aggregate ‘__esan::SidelineThread::runSideline(void*)::sigaltstack SigAltStack’ has incomplete type and cannot be defined

Patch from <https://github.com/google/sanitizers/issues/822>.

index d04f5909d..bc272dfe4 100644
--- a/lib/esan/esan_sideline_linux.cpp
+++ b/lib/esan/esan_sideline_linux.cpp
@@ -70,7 +70,7 @@ int SidelineThread::runSideline(void *Arg) {
 
   // Set up a signal handler on an alternate stack for safety.
   InternalScopedBuffer<char> StackMap(SigAltStackSize);
-  struct sigaltstack SigAltStack;
+  stack_t SigAltStack;
   SigAltStack.ss_sp = StackMap.data();
   SigAltStack.ss_size = SigAltStackSize;
   SigAltStack.ss_flags = 0;
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<div class='path'>path: <a href='/guix/log/?id=92bd81a96f4cac9d0fe628b82ffb1d127ad3e42f&amp;showmsg=1'>root</a>/<a href='/guix/log/configure.ac?id=92bd81a96f4cac9d0fe628b82ffb1d127ad3e42f&amp;showmsg=1'>configure.ac</a></div><div class='content'><table class='list nowrap'><tr class='nohover'><th class='left'>Age</th><th class='left'>Commit message (<a href='/guix/log/configure.ac?id=92bd81a96f4cac9d0fe628b82ffb1d127ad3e42f'>Collapse</a>)</th><th class='left'>Author</th></tr>
<tr class='logheader'><td><span title='2023-10-22 20:35:15 -0400'>2023-10-22</span></td><td class='logsubject'><a href='/guix/commit/configure.ac?id=4cf4dcb8b31274a8dfba6bae3a6826a1b521da3f'>teams: Adjust shebang to use 'guix repl'.</a></td><td>Maxim Cournoyer</td></tr>
<tr class='nohover-highlight'><td/><td colspan='3' class='logmsg'>
This ensures the correct Guix dependencies are always available for the
script.

* etc/teams.scm.in: Rename to...
* etc/teams.scm: ... this.  Adjust shebang.
* .gitignore: No longer ignore it.
* configure.ac: Do not process it with AC_CONFIG_FILES.

Reported-by: Clément Lassieur &lt;clement@lassieur.org&gt;
Fixes: https://issues.guix.gnu.org/66605
Change-Id: I7a01750c6c5f0696b6c36b1e6caa9389d9e6822c


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<tr class='logheader'><td><span title='2023-09-26 17:36:58 +0200'>2023-09-26</span></td><td class='logsubject'><a href='/guix/commit/configure.ac?id=f651a359691cbe4750f1fe8d14dd964f7971f916'>build: Add dependency on Git.</a></td><td>Ludovic Courtès</td></tr>
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* configure.ac: Check for ‘git’ and substitute ‘GIT’.
* guix/config.scm.in (%git): New variable.
* guix/self.scm (compiled-guix): Define ‘git’ and pass it to
‘make-config.scm’.
(make-config.scm): Add #:git; emit a ‘%git’ variable.
* doc/guix.texi (Requirements): Add it.


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