Remove unused BuildRequires

From gc official website:
Starting with 8.0, libatomic_ops is only required if the compiler does not understand gcc's C atomic intrinsics.

Signed-off-by: sdlzx <liuzixian4@huawei.com>

gc.spec

@@ -1,12 +1,12 @@
 Name:    gc
 Version: 8.0.6
-Release: 1
+Release: 2
 Summary: A garbage collector for C and C++
 License: BSD and GPLv1+
 Url:     http://www.hboehm.info/gc/
 Source0: http://www.hboehm.info/gc/gc_source/gc-%{version}.tar.gz
 
-BuildRequires: gcc gcc-c++ libtool libatomic_ops-devel
+BuildRequires: gcc gcc-c++ libtool
 
 %description
 The Boehm-Demers-Weiser conservative garbage collector can be
@@ -72,6 +72,12 @@ make check
 
 
 %changelog
+* Tue Oct 18 2022 Liu Zixian <liuzixian4@huawei.com> - 8.0.6-2
+- Type:cleancode
+- ID:NA
+- SUG:NA
+- DESC:Remove unused BuildRequires
+
 * Thu Dec 2 2021 wangjie <wangjie375@huawei.com> - 8.0.6-1
 - Type:enhancement
 - ID:NA