[build] Don't include library in package("curl")

package() targets should not be used for plain shared libraries.
The package("curl") target is just for the curl executable, not
for libcurl.

Change-Id: I5bf4954264665778b0c5e5ce8dfc4c761ed43b1e
diff --git a/BUILD.gn b/BUILD.gn
index ef208e3..bf8377b 100644
--- a/BUILD.gn
+++ b/BUILD.gn
@@ -33,16 +33,11 @@
 
   deps = [
     ":curl_bin",
-    ":libcurl",
   ]
 
   binaries = [ {
         name = "curl"
       } ]
-
-  libraries = [ {
-        name = "libcurl.so"
-      } ]
 }
 
 config("curl_config") {