grep: fix grep -x to not set REG_NOSUB

When -F isn't specified (and !ENABLE_EXTRA_COMPAT), grep -x uses
regexec's regmatch_t output to determine if the match was the entire
line. However it also set the REG_NOSUB flag which makes it ignore the
regmatch_t argument.

Add an exception to the setting of REG_NOSUB for OPT_x and add some test
cases to test the behaviour of -x.

Signed-off-by: James Hogan <james.hogan@imgtec.com>
Cc: Natanael Copa <ncopa@alpinelinux.org>
Cc: Denys Vlasenko <vda.linux@googlemail.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
find:: get rid of nested function (it's a gcc-ism)

function                                             old     new   delta
alloc_action                                           -      80     +80
parse_params                                        1459    1445     -14
static.alloc_action                                   98       -     -98
------------------------------------------------------------------------------
(add/remove: 1/1 grow/shrink: 0/1 up/down: 80/-112)           Total: -32 bytes

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
udhcpc: fix a problem with binary-encoded options #2

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
udhcp: code shrink

function                                             old     new   delta
attach_option                                        416     413      -3
allocate_tempopt_if_needed                            74       -     -74

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
stty: code shrink

function                                             old     new   delta
set_mode                                             759     725     -34

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
stty: disable CIBAUD leak check - it is not necessary on Linux

function                                             old     new   delta
stty_main                                           1233    1196     -37

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
Merge remote-tracking branch 'bb/master' into HEAD