Enable libuv on Solaris 10

We've ported our libuv to this platform so we can build it now.

CMakeLists.txt

@@ -509,12 +509,6 @@ int main(void) { return 0; }
     elseif(CMAKE_SYSTEM_NAME STREQUAL "HP-UX")
       # Disable until it can be ported.
       set(CMAKE_USE_LIBUV 0)
-    elseif(CMAKE_SYSTEM_PROCESSOR MATCHES "sparc")
-      # Disable until it can be ported.
-      set(CMAKE_USE_LIBUV 0)
-    elseif(CMAKE_SYSTEM STREQUAL "SunOS-5.10")
-      # Disable until it can be ported.
-      set(CMAKE_USE_LIBUV 0)
     endif()
   endif()
   if(CMAKE_USE_LIBUV)