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

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Fix -Wundef warnings.  Part of this upstream commit:
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commit dd0ba018122e88937a5f14b6594b9a40693b2e58
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Author: Paul Eggert <eggert@cs.ucla.edu>
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Date:   Sat Jun 28 06:15:54 2014 +0530
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    Sync up mktime with gnulib
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diff --git a/time/mktime.c b/time/mktime.c
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index e1fbf9ea197d3c8b..bc914d80593b91f2 100644
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--- a/time/mktime.c
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+++ b/time/mktime.c
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@@ -38,7 +38,7 @@
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 #include <string.h>		/* For the real memcpy prototype.  */
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-#if DEBUG
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+#if defined DEBUG && DEBUG
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 # include <stdio.h>
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 # include <stdlib.h>
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 /* Make it work even if the system's libc has its own mktime routine.  */
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@@ -600,7 +600,7 @@ libc_hidden_def (mktime)
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 libc_hidden_weak (timelocal)
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 #endif
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-#if DEBUG
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+#if defined DEBUG && DEBUG
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 static int
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 not_equal_tm (const struct tm *a, const struct tm *b)