Tests: Fix RunCMake.BuildDepends filesystem delay for Watcom WMake

Our 1.125s delay does not seem to be long enough to be reliable with
the Watcom `wmake` tool.  Use a longer delay for Watcom.

Tests/RunCMake/BuildDepends/RunCMakeTest.cmake

 include(RunCMake)
 
-if(RunCMake_GENERATOR STREQUAL "Borland Makefiles")
+if(RunCMake_GENERATOR STREQUAL "Borland Makefiles" OR
+   RunCMake_GENERATOR STREQUAL "Watcom WMake")
   set(fs_delay 3)
 else()
   set(fs_delay 1.125)