Fixed some warnings in httpclient, net, and openssl.

lib/pure/asyncnet.nim

@@ -428,9 +428,6 @@ proc recvLine*(socket: AsyncSocket,
   ##
   ## **Warning**: ``recvLine`` on unbuffered sockets assumes that the protocol
   ## uses ``\r\L`` to delimit a new line.
-  template addNLIfEmpty(): stmt =
-    if result.len == 0:
-      result.add("\c\L")
   assert SocketFlag.Peek notin flags ## TODO:
 
   # TODO: Optimise this
@@ -458,7 +455,8 @@ proc bindAddr*(socket: AsyncSocket, port = Port(0), address = "") {.
     of AF_INET6: realaddr = "::"
     of AF_INET:  realaddr = "0.0.0.0"
     else:
-      raiseOSError("Unknown socket address family and no address specified to bindAddr")
+      raise newException(ValueError,
+        "Unknown socket address family and no address specified to bindAddr")
 
   var aiList = getAddrInfo(realaddr, port, socket.domain)
   if bindAddr(socket.fd, aiList.ai_addr, aiList.ai_addrlen.Socklen) < 0'i32:

lib/pure/httpclient.nim

@@ -335,7 +335,7 @@ proc addFiles*(p: var MultipartData, xs: openarray[tuple[name, file: string]]):
   var m = newMimetypes()
   for name, file in xs.items:
     var contentType: string
-    let (dir, fName, ext) = splitFile(file)
+    let (_, fName, ext) = splitFile(file)
     if ext.len > 0:
       contentType = m.getMimetype(ext[1..ext.high], nil)
     p.add(name, readFile(file), fName & ext, contentType)
@@ -627,7 +627,7 @@ proc newAsyncHttpClient*(userAgent = defUserAgent,
   result.userAgent = defUserAgent
   result.maxRedirects = maxRedirects
   when defined(ssl):
-    result.sslContext = net.SslContext(sslContext)
+    result.sslContext = sslContext
 
 proc close*(client: AsyncHttpClient) =
   ## Closes any connections held by the HTTP client.

lib/wrappers/openssl.nim

@@ -260,7 +260,7 @@ proc OpenSSL_add_all_algorithms*(){.cdecl, dynlib: DLLUtilName, importc: "OPENSS
 
 proc OPENSSL_config*(configName: cstring){.cdecl, dynlib: DLLSSLName, importc.}
 
-when not useWinVersion:
+when not useWinVersion and not defined(macosx):
   proc CRYPTO_set_mem_functions(a,b,c: pointer){.cdecl,
     dynlib: DLLUtilName, importc.}
 
@@ -532,7 +532,7 @@ proc md5_File* (file: string): string {.raises: [IOError,Exception].} =
 
   result = hexStr(buf)
 
-proc md5_Str* (str:string): string {.raises:[IOError].} =
+proc md5_Str*(str:string): string =
   ##Generate MD5 hash for a string. Result is a 32 character
   #hex string with lowercase characters
   var