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workaround stack bashing by asm on 32-bit OpenBSD

like Darwin, disable x86inc with 32-bit PIC/shared library builds;
avoids stack smashing done by vp9_subpixel_*

workaround for issue #808

Change-Id: I3f2f16bd91822c8e8dad0242b5dcfb0e621aea97

--- a/build/make/configure.sh

+++ b/build/make/configure.sh

@@ -1243,10 +1243,14 @@

   fi

   tgt_os_no_version=$(echo "${tgt_os}" | tr -d "[0-9]")

+  if [ "${tgt_os_no_version}" = "darwin" ] || \

+     [ "${tgt_os_no_version}" = "openbsd" ] || [ "`uname`" = "OpenBSD" ]; then

+    openbsd_like=yes

+  fi

   # Default use_x86inc to yes when we are 64 bit, non-pic, or on any

   # non-Darwin target.

   if [ "${tgt_isa}" = "x86_64" ] || [ "${pic}" != "yes" ] || \

-      [ "${tgt_os_no_version}" != "darwin" ]; then

+      [ "${openbsd_like}" != "yes" ]; then

     soft_enable use_x86inc

   fi