lib: do not try to build lanplus if it is disabled

If lanplus is disabled, we do not want to build it, especially when
openssl is disabled, otherwise it fails to build with:

    make[4]: Entering directory `/home/buildroot/build/instance-0/output/build/ipmiutil-2.9.5/lib/lanplus'
    /home/buildroot/build/instance-0/output/host/usr/bin/i686-ctng-linux-gnu-gcc -DHAVE_CONFIG_H 
    -I. -I../.. -I. -I./inc   -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64 
    -DLINUX -DSKIP_MD2 -fPIC  -fstack-protector --param=ssp-buffer-size=4 -D_FORTIFY_SOURCE=2 -fPIC
    -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64   -Os  -c -o lanplus.o lanplus.c
    In file included from lanplus.c:78:0:
    ./inc/ipmitool/ipmi.h:51:25: fatal error: openssl/evp.h: No such file or directory

Sample build error visible at:
    http://autobuild.buildroot.org/results/04a/04a1c48d484debd7894fd32997ed50d3a0110b93/build-end.log

Signed-off-by: "Yann E. MORIN" <yann.morin.1998@free.fr>

diff -durN ipmiutil-2.9.5.orig/configure.ac ipmiutil-2.9.5/configure.ac
--- ipmiutil-2.9.5.orig/configure.ac	2015-05-23 19:33:54.293468417 +0200
+++ ipmiutil-2.9.5/configure.ac	2015-05-23 19:31:41.595877435 +0200
@@ -474,6 +474,8 @@
 AC_SUBST(SHR_LINK)
 AC_SUBST(pkgconfigdir)
 
+AM_CONDITIONAL([LANPLUS], [test x$LANPLUS_SAM = xyes])
+
 AC_OUTPUT(Makefile util/Makefile lib/Makefile lib/libipmiutil.pc lib/lanplus/Makefile doc/Makefile scripts/Makefile)
 
 if test "x$sysname" = "xSunOS"; then
diff -durN ipmiutil-2.9.5.orig/lib/lanplus/Makefile.am ipmiutil-2.9.5/lib/lanplus/Makefile.am
--- ipmiutil-2.9.5.orig/lib/lanplus/Makefile.am	2014-11-04 18:46:11.000000000 +0100
+++ ipmiutil-2.9.5/lib/lanplus/Makefile.am	2015-05-23 19:32:30.956469461 +0200
@@ -1,5 +1,7 @@
 #  Makefile.am for libipmi_lanplus.so and libipmi_lanplus.a
 
+if LANPLUS
+
 ODIR 	= obj
 CFLAGS_STATIC  = @OS_CFLAGS@ -DSTATIC -fno-strict-aliasing -fPIC $(CFLAGS) 
 AM_CFLAGS  = @OS_CFLAGS@ -fPIC  @LANPLUS_CFLAGS@
@@ -53,3 +55,4 @@
 #$(ODIR)/%.o:    %.c $(ODIR)
 #	$(CC) -c $(CFLAGS_STATIC) $(INCLUDES) -o $@ $<
 
+endif
diff -durN ipmiutil-2.9.5.orig/lib/Makefile.am ipmiutil-2.9.5/lib/Makefile.am
--- ipmiutil-2.9.5.orig/lib/Makefile.am	2014-11-04 18:46:11.000000000 +0100
+++ ipmiutil-2.9.5/lib/Makefile.am	2015-05-23 19:41:06.378636668 +0200
@@ -32,28 +32,39 @@
 	    else cp -f libipmiapi64.a.redhat  libipmiapi.a; fi \
           else cp -f libipmiapi32.a libipmiapi.a; fi \
 	fi
+if LANPLUS
 	cd lanplus; make clean; make  
 	cp -f lanplus/libipmi_lanplus.a  .
+endif # LANPLUS
 
 clean:
 	rm -f libipmiapi.a lib*_lanplus.a lib*_lanplus.so
+if LANPLUS
 	cd lanplus; make clean
+endif # LANPLUS
 
 clobber:
 	rm -f libipmiapi.a lib*_lanplus.a  lib*_lanplus.so
+if LANPLUS
 	cd lanplus; make clean
+endif # LANPLUS
 	
 distclean:
 	rm -f libipmiapi.a lib*.a  lib*_lanplus.so
+if LANPLUS
 	cd lanplus; make distclean
+endif # LANPLUS
 	
 install:
 	$(MKDIR) ${datato}
+if LANPLUS
 	cd lanplus; make install
+endif # LANPLUS
 
 check:
 
 installso:
+if LANPLUS
 	@if [ -d /usr/lib64 ]; then \
 	$(MKDIR) ${lib64} ; \
 	echo "installing libipmi_lanplus into ${lib64}"; \
@@ -68,4 +79,5 @@
 	(cd ${lib32} && rm -f libipmi_lanplus.* ); \
 	../../libtool --finish ${lib64} \
 	fi
+endif # LANPLUS