Fix #469 - Remove Unicode quotes from GCC errors, which cause issues

test/handler/test_common_handlers.vader

@@ -53,7 +53,7 @@ Execute (HandleGCCFormat should handle the correct lines of output):
   \     'lnum': 10,
   \     'col': 27,
   \     'type': 'E',
-  \     'text': 'invalid operands to binary - (have ‘int’ and ‘char *’)',
+  \     'text': 'invalid operands to binary - (have ''int'' and ''char *'')',
   \   },
   \ ],
   \ ale#handlers#gcc#HandleGCCFormat(42, [
@@ -61,6 +61,18 @@ Execute (HandleGCCFormat should handle the correct lines of output):
   \   '<stdin>:10:27: error: invalid operands to binary - (have ‘int’ and ‘char *’)',
   \ ])
 
+Execute (HandleGCCFormat should replace Unicode quotes):
+  AssertEqual
+  \ [
+  \   {
+  \     'lnum': 8,
+  \     'col': 5,
+  \     'type': 'W',
+  \     'text': "'''' \"\"",
+  \   },
+  \ ],
+  \ ale#handlers#gcc#HandleGCCFormat(42, ['<stdin>:8:5: warning: `´‘’ “”'])
+
 Execute (HandleUnixFormatAsError should handle some example lines of output):
   AssertEqual
   \ [

test/handler/test_vint_handler.vader

@@ -12,13 +12,13 @@ Execute(The vint handler should parse error messages correctly):
   \   {
   \     'lnum': 3,
   \     'col': 17,
-  \     'text': 'Use robust operators `==#` or `==?` instead of `==` (see Google VimScript Style Guide (Matching))',
+  \     'text': 'Use robust operators ''==#'' or ''==?'' instead of ''=='' (see Google VimScript Style Guide (Matching))',
   \     'type': 'W',
   \   },
   \   {
   \     'lnum': 3,
   \     'col': 8,
-  \     'text': 'Make the scope explicit like `l:filename` (see Anti-pattern of vimrc (Scope of identifier))',
+  \     'text': 'Make the scope explicit like ''l:filename'' (see Anti-pattern of vimrc (Scope of identifier))',
   \     'type': 'W',
   \   },
   \   {