[vte] build: Check for explicit_bzero()

[Christian Persch <chpe src gnome org>]

commit d74609f0adfdd6bc17302a8865d70ff12d5e0497
Author: Christian Persch <chpe gnome org>
Date:   Tue Feb 14 19:52:25 2017 +0100

    build: Check for explicit_bzero()

 configure.ac |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index fe72d3c..c646c8b 100644
--- a/configure.ac
+++ b/configure.ac
@@ -292,6 +292,7 @@ AC_CHECK_FUNCS([cfmakeraw fork setsid setpgid getpgid tcgetattr tcsetattr])
 
 # Misc I/O routines.
 AC_CHECK_FUNCS([pread pwrite])
+AC_CHECK_FUNCS([explicit_bzero])
 
 # for vtespawn
 AC_CHECK_HEADERS([sys/resource.h])