notify: use "constexpr" only with glibc

The Mutex and Cond constructors are only "constexpr" with glibc, and this is what this #ifdef is about. Backport of commit 459a812a See http://bugs.musicpd.org/view.php?id=4511

notify: use "constexpr" only with glibc
53677172 · Max Kellermann · bef0ccf4 · 53677172 · 53677172
Commit 53677172 authored Sep 17, 2015 by Max Kellermann
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NEWS NEWS +1 -0

notify.hxx src/notify.hxx +1 -1

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--- a/NEWS
+++ b/NEWS
 ver 0.19.15 (not yet released)
+* fix more build failures on non-glibc builds due to constexpr Mutex

 ver 0.19.14 (2016/03/18)
 * decoder

--- a/src/notify.hxx
+++ b/src/notify.hxx
@@ -28,7 +28,7 @@ struct notify {
 	Cond cond;
 	bool pending;

-#if !defined(WIN32) && !defined(__NetBSD__) && !defined(__BIONIC__)
+#ifdef __GLIBC__
 	constexpr
 #endif
 	notify():pending(false) {}