Backport of glibc 2.19 and 2.20 and 2.21 support.

Upstream-Status: Backport
Signed-off-by: Ross Burton <ross.burton@intel.com>

diff --git a/configure.ac b/configure.ac
index 229ab98..1c18108 100644
--- a/configure.ac
+++ b/configure.ac
@@ -918,6 +918,27 @@ case "${GLIBC_VERSION}" in
 	DEFAULT_SUPP="glibc-2.34567-NPTL-helgrind.supp ${DEFAULT_SUPP}"
 	DEFAULT_SUPP="glibc-2.X-drd.supp ${DEFAULT_SUPP}"
 	;;
+     2.19)
+	AC_MSG_RESULT(2.19 family)
+	AC_DEFINE([GLIBC_2_19], 1, [Define to 1 if you're using glibc 2.19.x])
+	DEFAULT_SUPP="glibc-2.X.supp ${DEFAULT_SUPP}"
+	DEFAULT_SUPP="$srcdir/glibc-2.34567-NPTL-helgrind.supp ${DEFAULT_SUPP}"
+	DEFAULT_SUPP="$srcdir/glibc-2.X-drd.supp ${DEFAULT_SUPP}"
+	;;
+     2.20)
+	AC_MSG_RESULT(2.20 family)
+	AC_DEFINE([GLIBC_2_20], 1, [Define to 1 if you're using glibc 2.20.x])
+	DEFAULT_SUPP="glibc-2.X.supp ${DEFAULT_SUPP}"
+	DEFAULT_SUPP="$srcdir/glibc-2.34567-NPTL-helgrind.supp ${DEFAULT_SUPP}"
+	DEFAULT_SUPP="$srcdir/glibc-2.X-drd.supp ${DEFAULT_SUPP}"
+	;;
+     2.21)
+	AC_MSG_RESULT(2.21 family)
+	AC_DEFINE([GLIBC_2_21], 1, [Define to 1 if you're using glibc 2.21.x])
+	DEFAULT_SUPP="glibc-2.X.supp ${DEFAULT_SUPP}"
+	DEFAULT_SUPP="$srcdir/glibc-2.34567-NPTL-helgrind.supp ${DEFAULT_SUPP}"
+	DEFAULT_SUPP="$srcdir/glibc-2.X-drd.supp ${DEFAULT_SUPP}"
+	;;
      darwin)
 	AC_MSG_RESULT(Darwin)
 	AC_DEFINE([DARWIN_LIBC], 1, [Define to 1 if you're using Darwin])