[rubygem-ffi] Use %{gem_extdir_mri} instead of %{gem_extdir}.

[Vít Ondruch]

commit 11c49be90e91e047d653581d63429527535b0e47
Author: Vít Ondruch <vondruch at redhat.com>
Date:   Mon Feb 25 13:13:58 2013 +0100

    Use %{gem_extdir_mri} instead of %{gem_extdir}.

 rubygem-ffi.spec |    6 +++---
 1 files changed, 3 insertions(+), 3 deletions(-)
---
diff --git a/rubygem-ffi.spec b/rubygem-ffi.spec
index 7d6f968..fcc4780 100644
--- a/rubygem-ffi.spec
+++ b/rubygem-ffi.spec
@@ -43,8 +43,8 @@ mkdir -p %{buildroot}%{gem_dir}
 cp -pa .%{gem_dir}/* \
         %{buildroot}%{gem_dir}/
 
-mkdir -p %{buildroot}%{gem_extdir}/lib
-mv %{buildroot}%{gem_instdir}/lib/ffi_c.so %{buildroot}%{gem_extdir}/lib/
+mkdir -p %{buildroot}%{gem_extdir_mri}/lib
+mv %{buildroot}%{gem_instdir}/lib/ffi_c.so %{buildroot}%{gem_extdir_mri}/lib/
 
 %check
 pushd .%{gem_instdir}
@@ -67,7 +67,7 @@ popd
 %{gem_instdir}/ffi.gemspec
 %{gem_libdir}
 %{gem_instdir}/spec
-%{gem_extdir}/
+%{gem_extdir_mri}/
 %exclude %{gem_cache}
 %{gem_spec}