[gnome-keyring/wip/dueno/madvise] build: Remove configure check for MADV_DONTDUMP

[Daiki Ueno <dueno src gnome org>]

commit 198d70364554dea570033aded74b339d1dc1d3a1
Author: Daiki Ueno <dueno src gnome org>
Date:   Wed May 15 06:42:44 2019 +0200

    build: Remove configure check for MADV_DONTDUMP
    
    It can be checked in the source code instead.

 configure.ac            | 8 --------
 egg/egg-secure-memory.c | 2 +-
 2 files changed, 1 insertion(+), 9 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index de0c759b..4b836641 100644
--- a/configure.ac
+++ b/configure.ac
@@ -183,14 +183,6 @@ AC_CHECK_FUNCS(gettimeofday fsync)
 
 AC_CHECK_FUNCS(mlock)
 
-# --------------------------------------------------------------------
-# Prevent memory from being included in core dumps
-#
-
-AC_CHECK_DEFINE([sys/mman.h],[MADV_DONTDUMP],
-  AC_DEFINE([HAVE_MADV_DONTDUMP], [1],
-    [Define if madvise knows about MADV_DONTDUMP]))
-
 # --------------------------------------------------------------------
 # socket()
 #
diff --git a/egg/egg-secure-memory.c b/egg/egg-secure-memory.c
index 3dca8fb5..ed6fbcc8 100644
--- a/egg/egg-secure-memory.c
+++ b/egg/egg-secure-memory.c
@@ -885,7 +885,7 @@ sec_acquire_pages (size_t *sz,
 
        DEBUG_ALLOC ("gkr-secure-memory: new block ", *sz);
 
-#if defined(HAVE_MADV_DONTDUMP)
+#if defined(MADV_DONTDUMP)
        if (madvise (pages, *sz, MADV_DONTDUMP) < 0) {
                if (show_warning && egg_secure_warnings) {
                        /*