util: move declarations out of qemu-common.h

Move declarations out of qemu-common.h for functions declared in
utils/ files: e.g. include/qemu/path.h for utils/path.c.
Move inline functions out of qemu-common.h and into new files (e.g.
include/qemu/bcd.h)

Signed-off-by: Veronia Bahaa <veroniabahaa@gmail.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
diff --git a/linux-user/syscall.c b/linux-user/syscall.c
index 9517531..032d338 100644
--- a/linux-user/syscall.c
+++ b/linux-user/syscall.c
@@ -18,6 +18,8 @@
  */
 #define _ATFILE_SOURCE
 #include "qemu/osdep.h"
+#include "qemu/cutils.h"
+#include "qemu/path.h"
 #include <elf.h>
 #include <endian.h>
 #include <grp.h>