[Script] Disable SDC writer in multiclock examples

openfpga_flow/openfpga_shell_scripts/global_tile_multiclock_example_script.openfpga

@@ -72,7 +72,9 @@ write_pnr_sdc --file ./SDC
 write_sdc_disable_timing_configure_ports --file ./SDC/disable_configure_ports.sdc
 
 # Write the SDC to run timing analysis for a mapped FPGA fabric
-write_analysis_sdc --file ./SDC_analysis
+# TODO: Currently SDC writer only supports 1 operating clock due to
+# - Missing information about which I/O is constrained by which clock
+#write_analysis_sdc --file ./SDC_analysis
 
 # Finish and exit OpenFPGA
 exit