shells: do not frocibly enable test, echo and kill _applets_,

just build relevant source and use xxx_main functions.
build system: add a special case when we have exactly one applet enabled
(makes "true", "false", "basename" REALLY tiny).
getopt32: do not use stdio.

function                                             old     new   delta
getopt32                                            1385    1412     +27
make_device                                         1187    1200     +13
basename_main                                        120     127      +7
tcpudpsvd_main                                      1922    1926      +4
testcmd                                                5       -      -5
echocmd                                                5       -      -5
fuser_main                                          1243    1231     -12
------------------------------------------------------------------------------
(add/remove: 0/2 grow/shrink: 4/1 up/down: 51/-22)             Total: 29 bytes

1 files changed, 0 insertions, 11 deletions

diff --git a/shell/Config.in b/shell/Config.in
index 5ea071c36..40e0217f4 100644
--- a/shell/Config.in
+++ b/shell/Config.in
@@ -36,7 +36,6 @@ endchoice
 config ASH
         bool "ash"
         default n
-        select TEST
         help
           Tha 'ash' shell adds about 60k in the default configuration and is
           the most complete and most pedantically correct shell included with
@@ -111,7 +110,6 @@ config ASH_GETOPTS
 config ASH_BUILTIN_ECHO
         bool "Builtin version of 'echo'"
         default y
-        select ECHO
         depends on ASH
         help
           Enable support for echo, builtin to ash.
@@ -119,7 +117,6 @@ config ASH_BUILTIN_ECHO
 config ASH_BUILTIN_TEST
         bool "Builtin version of 'test'"
         default y
-        select TEST
         depends on ASH
         help
           Enable support for test, builtin to ash.
@@ -170,10 +167,6 @@ config ASH_EXPAND_PRMT
 config HUSH
         bool "hush"
         default n
-        select TRUE
-        select FALSE
-        select TEST
-        select ECHO
         help
           hush is a very small shell (just 18k) and it has fairly complete
           Bourne shell grammar.  It even handles all the normal flow control
@@ -240,13 +233,9 @@ config LASH
         help
           lash is deprecated and will be removed, please migrate to hush.
 
-
 config MSH
         bool "msh"
         default n
-        select TRUE
-        select FALSE
-        select TEST
         help
           The minix shell (adds just 30k) is quite complete and handles things
           like for/do/done, case/esac and all the things you expect a Bourne