remove nearly-duplicate PATHs in several places

function                                             old     new   delta
bb_PATH_root_path                                      -      35     +35
varunset                                              60      58      -2
arith                                               2042    2033      -9
bb_default_root_login_path                            30       -     -30
.rodata                                           128794  128762     -32
which_main                                           152     117     -35
defpathvar                                            40       -     -40
------------------------------------------------------------------------------
(add/remove: 1/2 grow/shrink: 0/4 up/down: 35/-148)          Total: -113 bytes

1 files changed, 3 insertions, 2 deletions

diff --git a/include/libbb.h b/include/libbb.h
index 4f418e7c1..ce62f4529 100644
--- a/include/libbb.h
+++ b/include/libbb.h
@@ -953,8 +953,9 @@ extern const char bb_dev_null[];
 extern const char bb_busybox_exec_path[];
 /* util-linux manpage says /sbin:/bin:/usr/sbin:/usr/bin,
  * but I want to save a few bytes here */
-extern const char bb_default_root_login_path[]; /* "/sbin:/usr/sbin:/bin:/usr/bin" */
-#define bb_default_login_path (bb_default_root_login_path + sizeof("/sbin:/usr/sbin"))
+extern const char bb_PATH_root_path[]; /* "PATH=/sbin:/usr/sbin:/bin:/usr/bin" */
+#define bb_default_root_path (bb_PATH_root_path + sizeof("PATH"))
+#define bb_default_path      (bb_PATH_root_path + sizeof("PATH=/sbin:/usr/sbin"))
 
 extern const int const_int_0;
 extern const int const_int_1;