patch 8.0.1627: compiler warning for visibility attribute not supported

Problem:    Compiler warning for visibility attribute not supported on MinGW
            builds.
Solution:   Don't add the attribute when we don't expect it to work.
            (Christian Brabandt)
diff --git a/src/libvterm/src/vterm_internal.h b/src/libvterm/src/vterm_internal.h
index 3e7f1e5..a06d577 100644
--- a/src/libvterm/src/vterm_internal.h
+++ b/src/libvterm/src/vterm_internal.h
@@ -5,7 +5,7 @@
 
 #include <stdarg.h>
 
-#if defined(__GNUC__)
+#if defined(__GNUC__) && !defined(__MINGW32__)
 # define INTERNAL __attribute__((visibility("internal")))
 # define UNUSED __attribute__((unused))
 #else
diff --git a/src/version.c b/src/version.c
index e4878d6..0cc4920 100644
--- a/src/version.c
+++ b/src/version.c
@@ -767,6 +767,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1627,
+/**/
     1626,
 /**/
     1625,