Add an option to disable the zlib module

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
---
 configure.in |    6 ++++++
 1 file changed, 6 insertions(+)

Index: b/configure.ac
===================================================================
--- a/configure.ac
+++ b/configure.ac
@@ -2674,6 +2674,12 @@
             DISABLED_EXTENSIONS="${DISABLED_EXTENSIONS} bz2"
          fi])
 
+AC_ARG_ENABLE(zlib,
+       AS_HELP_STRING([--disable-zlib], [disable ZLIB]),
+       [ if test "$enableval" = "no"; then
+            DISABLED_EXTENSIONS="${DISABLED_EXTENSIONS} zlib"
+         fi])
+
 AC_ARG_ENABLE(dbm,
 	AS_HELP_STRING([--disable-dbm], [disable DBM]),
 	[ if test "$enableval" = "no"; then