Increased timeout for c-api tests as they may take long time on slow systems

Makefile

@@ -14,6 +14,7 @@ all:
 	tar xf libguestfs-1.42.0.tar.gz
 	patch -Np1 -d libguestfs-1.42.0 < libguestfs-1.42.0-certo.patch
 	patch -Np1 -d libguestfs-1.42.0 < libguestfs-1.42.0-mlv2v.patch
+	patch -Np1 -d libguestfs-1.42.0 < libguestfs-1.42.0-fix_test_timeout.patch
 	cd libguestfs-1.42.0 && ./configure --prefix=/usr --with-extra-packages="glibc readline ncurses util-linux xz pcre zlib systemd iproute2 libcap jansson augeas hivex libtirpc parted mdadm libaio cryptsetup popt openssl json-c cdrkit gptfdisk gcc"
 	$(MAKE) -C libguestfs-1.42.0
 	chown -Rv nobody libguestfs-1.42.0

libguestfs-1.42.0-fix_test_timeout.patch

+diff -uNr libguestfs-1.42.0/run.in libguestfs-1.42.0-fix_test_timeout/run.in
+--- libguestfs-1.42.0/run.in	2020-03-06 19:31:08.573072155 +0000
++++ libguestfs-1.42.0-fix_test_timeout/run.in	2020-07-14 17:18:34.725605797 +0000
+@@ -243,7 +243,7 @@
+ 
+ # Originally 1h, but that is not long enough to run the C API
+ # tests on Koji.
+-timeout_period=4h
++timeout_period=16h
+ timeout_kill=30s
+ 
+ # Must use the --foreground option (RHBZ#1025269).