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As this appears to be a pure optimization hint we should be save by ignoring it for now:

"If the information about the type of the file is easily available non-directories will be rejected but no extra work will be done to determine the information for each file. I.e., the caller must still be able to filter directories out."

  - René Rebe <rene@exactcode.de>

--- musl-1.1.15/include/glob.h.vanilla	2016-12-18 22:56:25.587321296 +0000
+++ musl-1.1.15/include/glob.h	2016-12-18 22:57:37.859322537 +0000
@@ -31,6 +31,8 @@
 #define GLOB_NOESCAPE 0x40
 #define	GLOB_PERIOD   0x80
 
+#define GLOB_ONLYDIR  0x00
+
 #define GLOB_NOSPACE 1
 #define GLOB_ABORTED 2
 #define GLOB_NOMATCH 3