libexec: fix compiler error for FreeBSD

rizsotto · rizsotto · commit 746358fa609d · 2020-09-29T00:20:05.000+10:00
diff --git a/source/intercept-library/library/lib.cc b/source/intercept-library/library/lib.cc
@@ -31,8 +31,7 @@
 #if defined HAVE_NSGETENVIRON
 #include <crt_externs.h>
 #else
-#include <unistd.h>
-
+extern char **environ;
 #endif
 
 namespace {
