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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<tr><td><span title='2019-02-12 23:30:16 +0100'>2019-02-12</span></td><td><a href='/guix/commit/tests/inferior.scm?id=739380542da7e434c581ec620edeb4348d6ece89'>inferior: Add 'inferior-available-packages'.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2018-11-28 10:39:58 +0100'>2018-11-28</span></td><td><a href='/guix/commit/tests/inferior.scm?id=94c0e61fe759924625c9e27d3da8c7c0c767ea2b'>inferior: Add 'inferior-eval-with-store'.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2018-09-21 17:04:37 +0200'>2018-09-21</span></td><td><a href='/guix/commit/tests/inferior.scm?id=811b21fb15d36b06fde994ca7ef5916a9a19f250'>profiles: 'packages-&gt;manifest' now accepts inferior packages.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2018-09-21 17:04:37 +0200'>2018-09-21</span></td><td><a href='/guix/commit/tests/inferior.scm?id=2e6d64e122ad2745154a38122785895d1b66c2ff'>inferior: Add 'inferior-package-&gt;manifest-entry'.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2018-09-21 17:04:37 +0200'>2018-09-21</span></td><td><a href='/guix/commit/tests/inferior.scm?id=eee8b303f6d82c1400fd8fd3b097406358ed7875'>inferior: Add 'inferior-package-search-paths' &amp; co.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
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<tr><td><span title='2018-09-21 17:04:37 +0200'>2018-09-21</span></td><td><a href='/guix/commit/tests/inferior.scm?id=9daf046c5dd9256e45073dfd4647e12de10dcb3e'>inferior: Add 'inferior-package-derivation'.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2018-09-04 17:22:55 +0200'>2018-09-04</span></td><td><a href='/guix/commit/tests/inferior.scm?id=7e1d229019c1924a2748e5daec2a619e7efbd7d7'>inferior: Add home-page and location package accessors.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
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