Fix lua https library when building with autotools

platform/unix/configure.ac

@@ -78,6 +78,7 @@ AS_VAR_IF([enable_gme], [yes], [ACLOVE_DEP_GME], [])
 AC_ARG_ENABLE([library-enet], [  --disable-library-enet    Turn off library enet], [], [enable_library_enet=yes])
 AC_ARG_ENABLE([library-luasocket], [  --disable-library-luasocket    Turn off library luasocket], [], [enable_library_luasocket=yes])
 AC_ARG_ENABLE([library-lua53], [  --disable-library-lua53    Turn off library lua53 (lua 5.3 backports, required by love.data)], [], [enable_library_lua53=yes])
+AC_ARG_ENABLE([library-luahttps], [  --disable-library-luahttps    Turn off library luahttps], [], [enable_library_luahttps=yes])
 
 # Select the libraries we need to build, based on the selected modules
 AS_VAR_IF([enable_module_filesystem], [yes], [enable_library_physfs=yes], [enable_library_physfs=no])