REORG: include: move common/fcgi.h to haproxy/
The file was moved almost verbatim (only stdio.h was dropped as useless).
It was not split between types and functions because it's only included
from direct C code (fcgi.c and mux_fcgi.c) as well as fcgi_app.h, included
from the same ones, which should also be remerged as a single one.
diff --git a/src/mux_fcgi.c b/src/mux_fcgi.c
index aa6c018..0e1d59c 100644
--- a/src/mux_fcgi.c
+++ b/src/mux_fcgi.c
@@ -12,7 +12,7 @@
#include <haproxy/api.h>
#include <common/cfgparse.h>
-#include <common/fcgi.h>
+#include <haproxy/fcgi.h>
#include <haproxy/h1.h>
#include <haproxy/htx.h>
#include <import/ist.h>