function symbol surround by ifndef else endif will not be find by gnu global

[weidong]

the attached file is test.c which expose  the bug

I can not find the symbol testfun when use the latest version of gnu global6.6.7

➜  gnu_global ls
GPATH  GRTAGS  GTAGS  gtags.files  test.c
➜  gnu_global ls -lh
总用量 56K
-rw-r--r-- 1 widon widon 16K 10月 21 20:09 GPATH
-rw-r--r-- 1 widon widon 16K 10月 21 20:09 GRTAGS
-rw-r--r-- 1 widon widon 16K 10月 21 20:09 GTAGS
-rw-r--r-- 1 widon widon   7 10月 21 20:09 gtags.files
-rw-r--r-- 1 widon widon 145 10月 21 20:09 test.c
➜  gnu_global global testfun
➜  gnu_global global main
test.c

but ctags can find the symbol, taglist use ctags

test.c
Description: Binary data