openssl: MSVC build: link and run MSASM with /SAFESEH

Actually the assembler requires lowercase /safeseh, oddly enough.

Change-Id: I1569409a2d6358282a7463ea996a6b1615e6ed8c
(cherry picked from commit 8f3ca083)
Reviewed-on: https://gerrit.libreoffice.org/47584Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Miklos Vajna <vmiklos@collabora.co.uk>

external/openssl/UnpackedTarball_openssl.mk

@@ -14,6 +14,7 @@ $(eval $(call gb_UnpackedTarball_set_tarball,openssl,$(OPENSSL_TARBALL),,openssl
 $(eval $(call gb_UnpackedTarball_add_patches,openssl,\
 	external/openssl/openssllnx.patch \
 	external/openssl/opensslwnt.patch \
+	$(if $(filter INTEL,$(CPUNAME)),external/openssl/opensslwnt_safeseh.patch) \
 	external/openssl/openssl-1.0.1h-win64.patch.1 \
 	external/openssl/opensslsol.patch \
 	external/openssl/opensslios.patch \

external/openssl/opensslwnt_safeseh.patch

+use /safeseh in 32-bit MSVC builds; this is not required for 64-bit
+
+diff -ru openssl.orig/util/mk1mf.pl openssl/util/mk1mf.pl
+--- a/openssl.orig/util/mk1mf.pl	2016-03-03 20:22:21.043924505 +0100
++++ b/openssl/util/mk1mf.pl	2016-03-03 20:34:45.015901171 +0100
+@@ -488,7 +493,7 @@
+ SRC_D=$src_dir
+ 
+ LINK_CMD=$link
+-LFLAGS=$lflags
++LFLAGS=$lflags /SAFESEH
+ RSC=$rsc \$(SOLARINC)
+ 
+ # The output directory for everything interesting
+@@ -511,7 +516,7 @@
+ MKDIR=$mkdir
+ MKLIB=$bin_dir$mklib
+ MLFLAGS=$mlflags
+-ASM=$bin_dir$asm
++ASM=$bin_dir$asm /safeseh
+ 
+ # FIPS validated module and support file locations
+