!37 Support build with clang

From: @luofeng14 
Reviewed-by: @dillon_chen 
Signed-off-by: @dillon_chen

rsync.spec

@@ -1,6 +1,6 @@
 Name:           rsync
 Version:        3.2.7
-Release:        2
+Release:        3
 Summary:        Fast incremental file transfer utility
 License:        GPL-3.0-or-later
 URL:            http://rsync.samba.org/
@@ -38,6 +38,9 @@ at one of the ends of the link beforehand.
 %autosetup -n %{name}-%{version} -p1
 
 %build
+%if "%{?toolchain}" == "clang"
+    CFLAGS="${CFLAGS:-%{?build_cflags}} -Wno-strict-prototypes"; export CFLAGS;
+%endif
 %configure --disable-xxhash
 %make_build
 
@@ -81,6 +84,12 @@ install -D -m644 %{SOURCE5} %{buildroot}/%{_unitdir}/rsyncd@.service
 %{_mandir}/man5/rsyncd.conf.5*
 
 %changelog
+* Thu Feb 22 2024 Xiaoya Huang <huangxiaoya@iscas.ac.cn> - 3.2.7-3
+- Type: enhencement
+- CVE:
+- SUG:NA
+- DESC: support clang build
+
 * Thu Jun 15 2023 zhoupengcheng <zhoupengcheng11@huawei.com> - 3.2.7-2
 - Type:bugfix
 - CVE: