extern char **environ has no standard home, so move the declaration from the .c
file to a handy .h file. Since this is a standard, old-school UNIX interface
dating from the 5th edition, it's not quite the same issue that the rule is
supposed to protect against, though.

Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Warner Losh <imp@bsdimp.com>
---
 bsd-user/main.c | 1 -
 bsd-user/qemu.h | 2 ++
 2 files changed, 2 insertions(+), 1 deletion(-)

diff --git a/bsd-user/main.c b/bsd-user/main.c
index cd1c26516b..71bfe17f38 100644
--- a/bsd-user/main.c
+++ b/bsd-user/main.c
@@ -47,7 +47,6 @@ unsigned long reserved_va;
 
 static const char *interp_prefix = CONFIG_QEMU_INTERP_PREFIX;
 const char *qemu_uname_release;
-extern char **environ;
 enum BSDType bsd_type;
 
 /*
diff --git a/bsd-user/qemu.h b/bsd-user/qemu.h
index 7ccc8ad397..5a82722281 100644
--- a/bsd-user/qemu.h
+++ b/bsd-user/qemu.h
@@ -27,6 +27,8 @@
 
 #include "exec/user/abitypes.h"
 
+extern char **environ;
+
 enum BSDType {
     target_freebsd,
     target_netbsd,
-- 
2.22.1