Added changelog

Signed-off-by: SuperIlu <superilu@yahoo.com>
diff --git a/ChangeLog.d/fix-compilation-with-djgpp.txt b/ChangeLog.d/fix-compilation-with-djgpp.txt
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+Bugfix:
+  * DJGPP does not provide `suseconds_t`, but defines `__unix__`
+  * `net_sockets.c` uses it for `mbedtls_net_usleep()`
+  * This fix makes use of the alternate codepath w/o `suseconds_t` if `__DJGPP__` is defined
+