Fix format string in error emitting (#5918)

* Add myself to the authors

* Fix format string

Author: tsatsulin

AUTHORS

@@ -317,4 +317,5 @@ a license to everyone to use it as detailed in LICENSE.)
 * José Carlos Pujol <josecpujol(at)gmail.com>
 * Dannii Willis <[email protected]>
 * Erik Dubbelboer <[email protected]>
+* Sergey Tsatsulin <[email protected]>
 

emcc.py

@@ -738,7 +738,7 @@ def setting_sub(s):
 
         if not arg.startswith('-'):
           if not os.path.exists(arg):
-            exit_with_error('%s: No such file or directory ("%s" was expected to be an input file, based on the commandline arguments provided)', arg, arg)
+            exit_with_error('%s: No such file or directory ("%s" was expected to be an input file, based on the commandline arguments provided)' % (arg, arg))
 
           arg_ending = filename_type_ending(arg)
           if arg_ending.endswith(SOURCE_ENDINGS + BITCODE_ENDINGS + DYNAMICLIB_ENDINGS + ASSEMBLY_ENDINGS + HEADER_ENDINGS) or shared.Building.is_ar(arg): # we already removed -o <target>, so all these should be inputs