Windows cmake fix

Fixes #248

CMakeLists.txt

@@ -92,13 +92,15 @@ target_link_libraries(example_edge_embed n2n)
 add_executable(example_sn_embed example_sn_embed.c)
 target_link_libraries(example_sn_embed n2n)
 
-# Linux Capabilities
-find_library(CAP_LIB cap)
-if(CAP_LIB)
-  target_link_libraries(edge cap)
-  set(CMAKE_REQUIRED_LIBRARIES ${CAP_LIB})
-  ADD_DEFINITIONS("-DHAVE_LIBCAP")
-endif()
+if(NOT DEFINED WIN32)
+  # Linux Capabilities
+  find_library(CAP_LIB cap)
+  if(CAP_LIB)
+    target_link_libraries(edge cap)
+    set(CMAKE_REQUIRED_LIBRARIES ${CAP_LIB})
+    ADD_DEFINITIONS("-DHAVE_LIBCAP")
+  endif()
+endif(NOT DEFINED WIN32)
 
 install(TARGETS edge supernode
         RUNTIME DESTINATION sbin