This patch fixes the following error when we compile with GCC 10.
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‘’openwrt/staging_dir/toolchain-aarch64_generic_gcc-10.2.0_musl/lib/gcc/aarch64-openwrt-linux-musl/10.2.0/../../../../aarch64-openwrt-linux-musl/bin/ld: ss_local-http.o:openwrt/build_dir/target-aarch64_generic_musl/shadowsocksr-libev/shadowsocksr-libev-2.5.6-d63ff863800a5645aca4309d5dd5962bd1e95543/src/http.h:32: multiple definition of `http_protocol'; ss_local-local.o:openwrt/build_dir/target-aarch64_generic_musl/shadowsocksr-libev/shadowsocksr-libev-2.5.6-d63ff863800a5645aca4309d5dd5962bd1e95543/src/http.h:32: first defined here
openwrt/staging_dir/toolchain-aarch64_generic_gcc-10.2.0_musl/lib/gcc/aarch64-openwrt-linux-musl/10.2.0/../../../../aarch64-openwrt-linux-musl/bin/ld: ss_local-tls.o:openwrt/build_dir/target-aarch64_generic_musl/shadowsocksr-libev/shadowsocksr-libev-2.5.6-d63ff863800a5645aca4309d5dd5962bd1e95543/src/tls.h:31: multiple definition of `tls_protocol'; ss_local-local.o:openwrt/build_dir/target-aarch64_generic_musl/shadowsocksr-libev/shadowsocksr-libev-2.5.6-d63ff863800a5645aca4309d5dd5962bd1e95543/src/tls.h:31: first defined here‘’
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