patch 8.1.1371: cannot recover from a swap file

Problem:    Cannot recover from a swap file.
Solution:   Do not expand environment variables in the swap file name.
            Do not check the extension when we already know a file is a swap
            file.  (Ken Takata, closes 4415, closes #4369)
diff --git a/src/spell.c b/src/spell.c
index 8f32fd7..fbe2080 100644
--- a/src/spell.c
+++ b/src/spell.c
@@ -2343,7 +2343,7 @@
 
 	    /* Check if we loaded this language before. */
 	    for (slang = first_lang; slang != NULL; slang = slang->sl_next)
-		if (fullpathcmp(lang, slang->sl_fname, FALSE) == FPC_SAME)
+		if (fullpathcmp(lang, slang->sl_fname, FALSE, TRUE) == FPC_SAME)
 		    break;
 	}
 	else
@@ -2395,7 +2395,8 @@
 	 * Loop over the languages, there can be several files for "lang".
 	 */
 	for (slang = first_lang; slang != NULL; slang = slang->sl_next)
-	    if (filename ? fullpathcmp(lang, slang->sl_fname, FALSE) == FPC_SAME
+	    if (filename ? fullpathcmp(lang, slang->sl_fname, FALSE, TRUE)
+								    == FPC_SAME
 			 : STRICMP(lang, slang->sl_name) == 0)
 	    {
 		region_mask = REGION_ALL;
@@ -2463,7 +2464,8 @@
 	    for (c = 0; c < ga.ga_len; ++c)
 	    {
 		p = LANGP_ENTRY(ga, c)->lp_slang->sl_fname;
-		if (p != NULL && fullpathcmp(spf_name, p, FALSE) == FPC_SAME)
+		if (p != NULL && fullpathcmp(spf_name, p, FALSE, TRUE)
+								== FPC_SAME)
 		    break;
 	    }
 	    if (c < ga.ga_len)
@@ -2472,7 +2474,8 @@
 
 	/* Check if it was loaded already. */
 	for (slang = first_lang; slang != NULL; slang = slang->sl_next)
-	    if (fullpathcmp(spf_name, slang->sl_fname, FALSE) == FPC_SAME)
+	    if (fullpathcmp(spf_name, slang->sl_fname, FALSE, TRUE)
+								== FPC_SAME)
 		break;
 	if (slang == NULL)
 	{