Added icudt as a possible library name when searching for ICU

Summary: This is because icudt is the form it is found in in windows. The short form names of the other parts of ICU are already present, it is just the data library that was missing.
Closes #5582

Reviewed By: @sgolemon

Differential Revision: D2216857

CMake/FindICU.cmake

@@ -60,7 +60,7 @@ if(ICU_INCLUDE_DIR AND ICU_LIBRARY)
   # Look for the ICU data libraries
   find_library(
       ICU_DATA_LIBRARY
-    NAMES icudata cygicudata cygicudata32
+    NAMES icudt icudata cygicudata cygicudata32
     DOC "Libraries to link against for ICU data")
   mark_as_advanced(ICU_DATA_LIBRARY)
   if (ICU_DATA_LIBRARY)