Use precondition instead of raising an exception.

Fixed bug#14062: CURL dynamic library not found exception is causing an internal failure in WEL

git-svn-id: https://svn.origo.ethz.ch/eiffelstudio/trunk/Src/library/cURL@72612 8089f293-4706-0410-a29e-feb5c42a2edf

curl_externals.e

@@ -16,16 +16,14 @@ feature -- Command
 
 	global_init is
 			-- Declared as curl_global_init().
+		require
+			dynamic_library_exists: is_dynamic_library_exists
 		local
 			l_ptr: POINTER
-			l_exception: CURL_DYNAMIC_LIBRARY_NOT_FOUND_EXCEPTION
 		do
 			l_ptr := api_loader.safe_load_api (module_name, "curl_global_init")
 			if l_ptr /= default_pointer then
 				c_curl_global_init (l_ptr, {CURL_GLOBAL_CONSTANTS}.curl_global_all);
-			else
-				create l_exception.make
-				l_exception.raise
 			end
 		end