!47 add loongarch64 support

From: @dpdwaj 
Reviewed-by: @xiezhipeng1 
Signed-off-by: @xiezhipeng1

libffi.spec

@@ -1,6 +1,6 @@
 Name:		libffi
 Version:	3.4.2
-Release:	2.h2
+Release:	3
 Summary:	A Portable Foreign Function Interface Library
 License:	MIT
 URL:		http://sourceware.org/libffi
@@ -10,7 +10,7 @@ Source2:	ffitarget-multilib.h
 
 Patch6000:	backport-x86-64-Always-double-jump-table-slot-size-for-CET-71.patch
 Patch6001:	backport-Fix-check-for-invalid-varargs-arguments-707.patch
- 
+Patch6002:	add-loongarch64-support.patch
 BuildRequires:	gcc gcc-c++ dejagnu
 
 %description
@@ -52,7 +52,12 @@ BuildArch:      noarch
 The help package contains man files.
 
 %prep
-%autosetup -p1 -n %{name}-%{version}
+%setup -q
+%patch6000 -p1
+%patch6001 -p1
+%ifarch loongarch64
+%patch6002 -p1
+%endif
 
 %build
 %configure \
@@ -96,6 +101,9 @@ fi
 %{_infodir}/libffi.info.gz
 
 %changelog
+* Fri Nov 18 2022 doupengda<doupengda@loongson.cn> - 3.4.2-3
+- add loongarch support
+
 * Mon Jul 25 2022 chenziyang<chenziyang4@huawei.com> - 3.4.2-2.h2
 - Type:bugfix
 - CVE:NA