use var in path

Author: mvorisek

.github/scripts/windows/build_task.bat

@@ -57,7 +57,7 @@ if "%INTRINSICS%" neq "" set ADD_CONF=%ADD_CONF% --enable-native-intrinsics=%INT
 
 set CFLAGS=/W1 /WX
 
-patch --binary C:\build-cache\deps-8.0-vs16-x86\include\net-snmp\net-snmp-config.h -i %~dp0net-snmp-config.h.patch.bin
+patch --binary %DEPS_DIR%\include\net-snmp\net-snmp-config.h -i %~dp0net-snmp-config.h.patch.bin
 
 cmd /c configure.bat ^
 	--enable-snapshot-build ^