build: Permit to build WAMR on FreeBSD

Signed-off-by: Hiroshi Hatake <[email protected]>

Author: cosmo0920

CMakeLists.txt

@@ -78,8 +78,9 @@ if(${CMAKE_SYSTEM_NAME} MATCHES "FreeBSD")
   set(CMAKE_CXX_LINK_FLAGS "${CMAKE_CXX_LINK_FLAGS} -lutil")
 endif()
 
-# *BSD is not supported platform for wasm-micro-runtime. Now, we should be disabled for these platforms.
-if(${CMAKE_SYSTEM_NAME} MATCHES "BSD")
+# *BSD is not supported platform for wasm-micro-runtime except for FreeBSD.
+# Now, we should be disabled for these platforms.
+if(NOT FLB_SYSTEM_FREEBSD AND ${CMAKE_SYSTEM_NAME} MATCHES "BSD")
   message(STATUS "This platform is not supported for WASM feature so disabled.")
   set(FLB_WASM OFF)
 endif()