output-sync test fails on both Make 4.1 and 4.0

[Jeffrey Cliff]

Make tests features/output-sync)both 4.0, 4.1) and
features/parallelism(4.1 only?) both seem to fail unless I bump up the timeouts
from to 10 seconds for each test.   Tests seem to work afterwards.

The computer this failed on is relatively primitive: It's only
singlecore with not a hell of a lot of ram (ie not parallel at all).
ie it makes sense if it's a race condition, as suggested by

https://lists.gnu.org/archive/html/bug-make/2013-05/msg00056.html
https://lists.gnu.org/archive/html/bug-make/2013-05/msg00060.html

So this is probably another datapoint that that 6-7 seconds is
insufficient in some cases

address@hidden:/mnt/lfs/sources/make-4.1$ cat /proc/cpuinfo
processor       : 0
vendor_id       : GenuineIntel
cpu family      : 15
model           : 2
model name      : Intel(R) Pentium(R) 4 CPU 2.66GHz
stepping        : 7
microcode       : 0x33
cpu MHz         : 2657.787
cache size      : 512 KB
fdiv_bug        : no
hlt_bug         : no
f00f_bug        : no
coma_bug        : no
fpu             : yes
fpu_exception   : yes
cpuid level     : 2
wp              : yes
flags           : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge
mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe
pebs bts cid xtpr
bogomips        : 5315.57
clflush size    : 64
cache_alignment : 128
address sizes   : 36 bits physical, 32 bits virtual
power management:

address@hidden:/mnt/lfs/sources/make-4.1$ free
             total       used       free     shared    buffers     cached
Mem:        510484     408876     101608          0      44616     167088


-- 
GENERATION 26: The first time you see this, copy it into your sig on any
forum and add 1 to the generation