patch 9.0.1426: indent wrong after "export namespace" in C++

Problem:    Indent wrong after "export namespace" in C++.
Solution:   Skip over "inline" and "export" in any order. (Virginia Senioria,
            closes #12134, closes #12133)
diff --git a/src/cindent.c b/src/cindent.c
index e8e255f..176bc05 100644
--- a/src/cindent.c
+++ b/src/cindent.c
@@ -769,7 +769,9 @@
 
     s = cin_skipcomment(s);
 
-    if (STRNCMP(s, "inline", 6) == 0 && (s[6] == NUL || !vim_iswordc(s[6])))
+    // skip over "inline" and "export" in any order
+    while ((STRNCMP(s, "inline", 6) == 0 || STRNCMP(s, "export", 6) == 0)
+					&& (s[6] == NUL || !vim_iswordc(s[6])))
 	s = cin_skipcomment(skipwhite(s + 6));
 
     if (STRNCMP(s, "namespace", 9) == 0 && (s[9] == NUL || !vim_iswordc(s[9])))