run-init: new applet

function                                             old     new   delta
switch_root_main                                     354     637    +283
drop_usermodehelper                                    -     157    +157
cap_name_to_number                                     -      77     +77
packed_usage                                       31707   31743     +36
applet_names                                        2665    2674      +9
applet_main                                         1544    1548      +4
applet_install_loc                                   193     194      +1
setpriv_main                                         933     928      -5
getcaps                                              131     122      -9
parse_cap                                            117      29     -88
------------------------------------------------------------------------------
(add/remove: 3/0 grow/shrink: 5/3 up/down: 567/-102)          Total: 465 bytes

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
diff --git a/include/libbb.h b/include/libbb.h
index 9535f5f..95a7470 100644
--- a/include/libbb.h
+++ b/include/libbb.h
@@ -1475,6 +1475,15 @@
 
 unsigned cap_name_to_number(const char *cap) FAST_FUNC;
 void printf_cap(const char *pfx, unsigned cap_no) FAST_FUNC;
+void drop_capability(int cap_ordinal) FAST_FUNC;
+/* Structures inside "struct caps" are Linux-specific and libcap-specific: */
+#define DEFINE_STRUCT_CAPS \
+struct caps { \
+	struct __user_cap_header_struct header; \
+	unsigned u32s; \
+	struct __user_cap_data_struct data[2]; \
+}
+void getcaps(void *caps) FAST_FUNC;
 
 unsigned cap_name_to_number(const char *name) FAST_FUNC;
 void printf_cap(const char *pfx, unsigned cap_no) FAST_FUNC;