[SheepShaver] Add mkdir obj to fix build failure on some systems

[Hans de Goede]

commit 841cf3ec919264f7ced5dda3f708ed26692dc959
Author: Hans de Goede <hdegoede at redhat.com>
Date:   Thu Jul 7 16:10:09 2016 +0200

    Add mkdir obj to fix build failure on some systems

 SheepShaver.spec | 1 +
 1 file changed, 1 insertion(+)
---
diff --git a/SheepShaver.spec b/SheepShaver.spec
index 4f27a6c..3174f71 100644
--- a/SheepShaver.spec
+++ b/SheepShaver.spec
@@ -55,6 +55,7 @@ popd
 
 %build
 pushd %{name}/src/Unix
+mkdir obj
 %configure --datadir=%{_sysconfdir} --enable-ppc-emulator=yes \
     --disable-xf86-dga --enable-sdl-audio --with-bincue
 DYNGEN_CFLAGS="$(echo $RPM_OPT_FLAGS | sed s/-fstack-protector-strong//)"