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[PATCH] Fix compilation on musl

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Using the ssize_t typedef requires including <unistd.h>. 

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See : https://sourceforge.net/p/dtorrent/patches/3/

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Signed-off-by: Brendan Heading <brendanheading@gmail.com>

Upstream-status: submitted

---

diff -Nur a/compat.c b/compat.c

--- a/compat.c  2015-07-29 18:22:24.658415171 +0100

+++ b/compat.c  2015-07-29 18:36:21.752576311 +0100

@@ -63,6 +63,7 @@

 #ifndef HAVE_STRNSTR

 #include <string.h>

+#include <unistd.h>

 /* FUNCTION PROGRAMER: Siberiaic Sang */

 char *strnstr(const char *haystack, const char *needle, size_t haystacklen)

 {