Blame SOURCES/glibc-rh1505492-undef-elision.patch

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Suppress -Wundef warning in glibc-rh841653-16.patch.  Specific to
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the previous backport, so no upstream patch.
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diff --git a/elf/dl-tunables.c b/elf/dl-tunables.c
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index b7c735891d66bac0..f86a6853d2f9b2e3 100644
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--- a/elf/dl-tunables.c
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+++ b/elf/dl-tunables.c
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@@ -27,7 +27,7 @@ void
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 internal_function
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 _dl_process_tunable_env_entries (void)
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 {
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-#if HAVE_ELISION
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+#ifdef HAVE_ELISION
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   char **ep;
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   const char *envname = { "RHEL_GLIBC_TUNABLES" };
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 # define TUNABLE_ELISION 0