Corrected a minor issue that cropped up today in which the search

for file extensions is greedy and picks the first matching extension
starting at the front of the string, such that, e.g., "file.ext.spice"
is interpreted as a ".ext" file and not a ".spice" file.

base/netfile.c

@@ -896,7 +896,9 @@ char *ReadNetlist(char *fname, int *fnum)
 
   /* make first pass looking for extension */
   for (index = 0; formats[index].extension != NULL; index++) {
-    if (strstr(fname, formats[index].extension) != NULL) {
+    int extlen = strlen(formats[index].extension);
+    int flen = strlen(fname);
+    if (!strcmp(fname + flen - extlen, formats[index].extension)) {
       return (*(formats[index].proc))(fname, fnum);
     }
   }