Update gc.spec to 8.0.6

* Switch URL to Github releases
* Remove --disable-static (default one in configure since 8.0.0)
* Remove --enable-parallel-mark (default one in configure since 8.0.0)

gc.spec

@@ -1,11 +1,11 @@
 Summary: Garbage collector for C and C++
 Name:    gc
-Version: 8.0.4
-Release: 6%{?dist}
+Version: 8.0.6
+Release: 1%{?dist}
 
 License: BSD
 URL:     https://www.hboehm.info/gc/
-Source0: https://www.hboehm.info/gc/gc_source/gc-%{version}%{?pre}.tar.gz
+Source0: https://github.com/ivmai/bdwgc/releases/download/v%{version}/gc-%{version}%{?pre}.tar.gz
 
 ## upstreamable patches
 
@@ -52,13 +52,9 @@ autoreconf -i -f
 CPPFLAGS="-DUSE_GET_STACKBASE_FOR_MAIN"; export CPPFLAGS
 
 %configure \
-  --disable-static \
   --disable-docs \
   --enable-cplusplus \
   --enable-large-config \
-%ifarch %{ix86}
-  --enable-parallel-mark \
-%endif
   --enable-threads=posix
 
 %make_build
@@ -107,6 +103,12 @@ make check %{?arch_ignore}
 
 
 %changelog
+* Thu Oct 7 2021 Ivan Maidanski <ivmai@mail.ru> - 8.0.6-1
+- 8.0.6
+- Source0: Switch URL to Github releases
+- %%build: remove --disable-static (default one since 8.0.0)
+- %%build: remove --enable-parallel-mark (default one since 8.0.0)
+
 * Wed Jul 21 2021 Fedora Release Engineering <releng@fedoraproject.org> - 8.0.4-6
 - Rebuilt for https://fedoraproject.org/wiki/Fedora_35_Mass_Rebuild