v.scanner: fix error line numbers when comments end with CRLF

vlib/v/checker/tests/.gitattributes

@@ -0,0 +1,2 @@
+*_crlf_*  binary
+*_lf_*    binary

vlib/v/checker/tests/error_with_comment_with_crlf_ending.out

@@ -0,0 +1,4 @@
+vlib/v/checker/tests/error_with_comment_with_crlf_ending.vv:2:6: error: unexpected name `should`
+    1 | // Empty lines don't cause an issue but as soon as there's a comment with a CRLF ending, it fails
+    2 | This should cause an error!
+      |      ~~~~~~

vlib/v/checker/tests/error_with_comment_with_crlf_ending.vv

@@ -0,0 +1,2 @@
+// Empty lines don't cause an issue but as soon as there's a comment with a CRLF ending, it fails
+This should cause an error!

vlib/v/checker/tests/error_with_comment_with_lf_ending.out

@@ -0,0 +1,4 @@
+vlib/v/checker/tests/error_with_comment_with_lf_ending.vv:2:6: error: unexpected name `should`
+    1 | // Empty lines don't cause an issue but as soon as there's a comment with a CRLF ending, it fails
+    2 | This should cause an error!
+      |      ~~~~~~

vlib/v/checker/tests/error_with_comment_with_lf_ending.vv

@@ -0,0 +1,2 @@
+// Empty lines don't cause an issue but as soon as there's a comment with a CRLF ending, it fails
+This should cause an error!

vlib/v/scanner/scanner.v

@@ -1092,10 +1092,14 @@ fn (mut s Scanner) text_scan() token.Token {
 				if nextc == `/` {
 					start := s.pos + 1
 					s.ignore_line()
-					comment_line_end := s.pos
-					s.pos--
+					mut comment_line_end := s.pos
+					if s.text[s.pos-1] == `\r` {
+						comment_line_end--
+					} else {
 						// fix line_nr, \n was read; the comment is marked on the next line
+						s.pos--
 						s.line_nr--
+					}                    
 					if s.should_parse_comment() {
 						s.line_comment = s.text[start + 1..comment_line_end]
 						mut comment := s.line_comment.trim_space()