Backport of glibc 2.19 and 2.20 and 2.21 support.

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

Index: valgrind-3.10.1/configure.ac
===================================================================
--- valgrind-3.10.1.orig/configure.ac
+++ valgrind-3.10.1/configure.ac
@@ -1018,6 +1018,34 @@ 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}"
+	;;
+     2.22)
+	AC_MSG_RESULT(2.22 family)
+	AC_DEFINE([GLIBC_2_22], 1, [Define to 1 if you're using glibc 2.22.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])