[test-suite] Disable ClamAV running on CSKY temporarily to not block constructing buildbot for CSKY

[zixuan-wu]

Summary

This test has problems running on CSKY with readdir getting wrong result. It's because the csky libc implementation can not avoid such bug discussed at https://sourceware.org/bugzilla/show_bug.cgi?id=23960#c64.
When the new related part of csky libc implementation has changed, like arc, risc-v, the comment should remove.
So just guard it temporarily to not block constructing buildbot for CSKY. we may fix it in libc in 1-2 months.

[zixuan-wu]

Gentle pin...

[lebedev.ri]

This review may be stuck/dead, consider abandoning if no longer relevant.
Removing myself as reviewer in attempt to clean dashboard.

MultiSource/Applications/CMakeLists.txt

 if(NOT TARGET_OS STREQUAL "SunOS")
   add_subdirectory(kimwitu++)
 endif()
 if(NOT TARGET_OS STREQUAL "SunOS")
   add_subdirectory(SPASS)
 endif()
 if(NOT ARCH STREQUAL "XCore")
   if(NOT TARGET_OS STREQUAL "AIX")
+      if(NOT ARCH STREQUAL "CSKY")
+      # This test has problems running on CSKY with readdir getting wrong result.
+      # It's because the csky libc implementation can not avoid such bug
+      # at https://sourceware.org/bugzilla/show_bug.cgi?id=23960#c64.
+      # When the csky libc implementation changed, like riscv implementation,
+      # it should remove. So just guard it temporarily.
         add_subdirectory(ClamAV)
       endif()
+  endif()
   add_subdirectory(lemon)
   add_subdirectory(siod)
 endif()
 if((NOT ARCH STREQUAL "PowerPC") AND (NOT ARCH STREQUAL "XCore"))
   add_subdirectory(sqlite3)
 endif()
 if(NOT TEST_SUITE_BENCHMARKING_ONLY)
   add_subdirectory(Burg)
   add_subdirectory(treecc)
 endif()