Fix editors/openoffice-4 build with clang 6.0.0 by compiling with

-std=gnu++98 since that was the default for the compilers historically
used for the build.  It turns out that -std=c++98 does not work
because the vigra headers depend on LLONG_MAX and friends, which
are not defined without the GNU extensions.

Compensate for a recent poudriere change by overriding $HOME and
setting it to /tmp if $HOME is not writeable.  Some of the test
code run during the build wants to use mkstemp() to create temporary
directories under $HOME, which does not work for the "nobody" user
which points $HOME at /nonexistent.

No PORTREVISION bump since this is a build fix and there is no
change to the package.

PR:		225129
Reported by:	jbeich

editors/openoffice-devel/Makefile

@@ -450,6 +450,9 @@ do-build:
 	fi ;								  \
 	cd ${WRKSRC}/instsetoo_native ;					  \
 	. ../${FREEBSD_ENV_SET} ;					  \
+	if [ -n "${HOME}" -a ! -w "${HOME}" ]; then			  \
+		export HOME=/tmp ;					  \
+	fi ;								  \
 	build.pl --all -P$${numproc} -- -P$${dmproc}
 
 do-install:

editors/openoffice-devel/files/patch-solenv_gbuild_platform_freebsd.mk

@@ -0,0 +1,10 @@
+--- solenv/gbuild/platform/freebsd.mk.orig	2017-11-27 13:50:25 UTC
++++ solenv/gbuild/platform/freebsd.mk
+@@ -94,6 +94,7 @@ gb_CXXFLAGS := \
+ 	-fno-use-cxa-atexit \
+ 	-fvisibility-inlines-hidden \
+ 	-fvisibility=hidden \
++	-std=gnu++98 \
+ 	-pipe
+ ifeq ($(COM),CLANG)
+ gb_CXXFLAGS += -DHAVE_STL_INCLUDE_PATH

editors/openoffice-devel/files/patch-solenv_inc_unxfbsd.mk

@@ -0,0 +1,11 @@
+--- solenv/inc/unxfbsd.mk.orig	2017-11-27 13:50:28 UTC
++++ solenv/inc/unxfbsd.mk
+@@ -96,7 +96,7 @@ CFLAGSEXCEPTIONS=-fexceptions -fno-enforce-eh-specs
+ CFLAGS_NO_EXCEPTIONS=-fno-exceptions
+ 
+ # -fpermissive should be removed as soon as possible
+-CFLAGSCXX= -pipe $(ARCH_FLAGS) 
++CFLAGSCXX= -pipe $(ARCH_FLAGS) -std=gnu++98
+ .IF "$(HAVE_GCC_VISIBILITY_FEATURE)" == "TRUE"
+ CFLAGSCXX += -fvisibility-inlines-hidden
+ .ENDIF # "$(HAVE_GCC_VISIBILITY_FEATURE)" == "TRUE"