Fix compilation issue on FreeBSD (bug #12841)

Hide getline call by checking for glibc. If not, use fgetln instead. Even
though this section is now #ifdef'ed for linux only, this should help make
it more portable if non-linux folks end up wanting it.

hw/xfree86/common/xf86AutoConfig.c

@@ -366,7 +366,11 @@ matchDriverFromFiles (char** matches, uint16_t match_vendor, uint16_t match_chip
                     goto end;
                 }
                 /* Read the file */
+                #ifdef __GLIBC__
                 while ((read = getline(&line, &len, fp)) != -1) {
+                #else
+                while ((line = fgetln(fp, &len)) != (char *)NULL) {
+                #endif /* __GLIBC __ */
                     xchomp(line);
                     if (isdigit(line[0])) {
                         strncpy(vendor_str, line, 4);