Optimize size by removing unused data and functions

Author: In-line

rehlds/build.gradle

@@ -170,8 +170,11 @@ void setupToolchain(NativeBinarySpec b) {
 		} else {
 			cfg.compilerOptions.args '-Qoption,cpp,--treat_func_as_string_literal_cpp'
 		}
-
+		cfg.compilerOptions.args '-ffunction-sections', '-fdata-sections' // Remove unused code and data
 		cfg.compilerOptions.args '-fno-rtti', '-fno-exceptions'
+
+		cfg.linkerOptions.args '-Wl,--version-script=../version_script.lds', '-Wl,--gc-sections'
+
 		cfg.projectLibpath(project, '/lib/linux32')
 		cfg.extraLibs 'rt', 'dl', 'm', 'steam_api', 'aelf32'
 	}

version_script.lds

@@ -0,0 +1,8 @@
+HLDS_ABI_1.0 {
+	global: 
+		CreateInterface;
+		F;
+		NET_Sleep_Timeout;
+	local: 
+		*;
+};