package/ipmiutil: avoid the need for autoreconf

Build fails since bump to version 3.1.7 in commit
011f31ee244b7fe4621b3f69ca3d7e7b1cfdb5bb because config.h.in is older
than aclocal.m4:

make[1]: Entering directory '/tmp/instance-4/output-1/build/ipmiutil-3.1.7'
(CDPATH="${ZSH_VERSION+.}:" && cd . && autoheader)
/bin/bash: autoheader: command not found

Fixes:
 - http://autobuild.buildroot.org/results/2005af881726473f2cda176e90c1e41e4baea67c

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>
(cherry picked from commit 5f9d65fb460b030597df21bbff94d9cbcb36d321)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/ipmiutil/ipmiutil.mk

@@ -11,6 +11,12 @@ IPMIUTIL_LICENSE_FILES = COPYING
 
 IPMIUTIL_MAKE = $(MAKE1)
 
+# aclocal.m4 is newer than config.h.in. Touch the latter to avoid autoreconf
+define IPMIUTIL_TOUCH_CONFIG_H_IN
+	touch $(@D)/config.h.in
+endef
+IPMIUTIL_PRE_CONFIGURE_HOOKS += IPMIUTIL_TOUCH_CONFIG_H_IN
+
 # forgets to link against libcrypto dependencies breaking static link
 ifeq ($(BR2_PACKAGE_OPENSSL)x$(BR2_STATIC_LIBS),yx)
 # tests against distro libcrypto so it might get a false positive when