Disable HTTP tests as they seem to deadlock when building in a chroot on NixOS.

diff --git a/src/transports/Makefile.in b/src/transports/Makefile.in
index b0b76a2..30a0bb5 100644
--- a/src/transports/Makefile.in
+++ b/src/transports/Makefile.in
@@ -38,8 +38,8 @@ PRE_UNINSTALL = :
 POST_UNINSTALL = :
 host_triplet = @host@
 check_PROGRAMS = test_udp$(EXEEXT) test_tcp$(EXEEXT) \
-	test_http$(EXEEXT) testrepeat_udp$(EXEEXT) \
-	testrepeat_tcp$(EXEEXT) testrepeat_http$(EXEEXT)
+	testrepeat_udp$(EXEEXT) \
+	testrepeat_tcp$(EXEEXT)
 subdir = src/transports
 DIST_COMMON = $(srcdir)/Makefile.am $(srcdir)/Makefile.in
 ACLOCAL_M4 = $(top_srcdir)/aclocal.m4