fix bug in python3 installation

libffi.spec

@@ -1,13 +1,14 @@
 Name:		libffi
 Version:	3.3
-Release:	4
+Release:	5
 Summary:	A Portable Foreign Function Interface Library
 License:	MIT
 URL:		http://sourceware.org/libff
 Source0:	ftp://sourceware.org/pub/libffi/%{name}-%{version}.tar.gz
 
 BuildRequires: gcc
-BuildRequires: libffi6 libffi7
+BuildRequires: libffi6
+Requires: libffi6 libffi7
 
 %description
 Compilers for high level languages generate code that follows certain conventions. These
@@ -106,6 +107,12 @@ fi
 %{_infodir}/libffi.info.gz
 
 %changelog
+* Wed Jan 15 2020 chengquan<chengquan3@huawei.com> - 3.3-5
+- Type:enhancement
+- ID:NA
+- SUG:NA
+- DESC:fixbug in python3 installation
+
 * Wed Jan 15 2020 chengquan<chengquan3@huawei.com> - 3.3-4
 - Type:enhancement
 - ID:NA