build system: drop PLATFORM_LINUX

PLATFORM_LINUX is a hidden configuration option which is disabled by
default and enabled at over a hundred locations for features that are
deemed to be Linux specific.

The only effect of PLATFORM_LINUX is to control compilation of
libbb/match_fstype.c.  This file is only needed by mount and umount.

Remove all references to PLATFORM_LINUX and compile match_fstype.c
if mount or umount is enabled.

Signed-off-by: Ron Yorston <rmy@pobox.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

1 files changed, 0 insertions, 1 deletions

diff --git a/util-linux/switch_root.c b/util-linux/switch_root.c
index a483893ed..c65096c27 100644
--- a/util-linux/switch_root.c
+++ b/util-linux/switch_root.c
@@ -9,7 +9,6 @@
 //config:config SWITCH_ROOT
 //config:       bool "switch_root (5.5 kb)"
 //config:       default y
-//config:       select PLATFORM_LINUX
 //config:       help
 //config:       The switch_root utility is used from initramfs to select a new
 //config:       root device. Under initramfs, you have to use this instead of