[user/tests/sysparams.c] Corrected run_spi_setmouse_test

[Paul Vriens]

Hi,

run_spi_setmouse_test is not correct for systems that do not support 
SystemParametersInfoW (my win98 box for example).

before (with extra tracing):

sysparams.c:367:testing SPI_{GET,SET}MOUSE
sysparams.c:298:Calling SystemParametersInfoW
sysparams.c:303:Calling SystemParametersInfoA
sysparams.c:303:Calling SystemParametersInfoA
sysparams.c:298:Calling SystemParametersInfoW
sysparams.c:303:Calling SystemParametersInfoA
sysparams.c:303:Calling SystemParametersInfoA
sysparams.c:298:Calling SystemParametersInfoW
sysparams.c:303:Calling SystemParametersInfoA
sysparams.c:303:Calling SystemParametersInfoA
sysparams.c:298:Calling SystemParametersInfoW
sysparams.c:303:Calling SystemParametersInfoA
sysparams.c:303:Calling SystemParametersInfoA

after (with patch and extra tracing):
sysparams.c:378:testing SPI_{GET,SET}MOUSE
sysparams.c:300:Calling SystemParametersInfoW
sysparams.c:306:SystemParametersInfoW not supported on this platform
sysparams.c:313:Calling SystemParametersInfoA
sysparams.c:313:Calling SystemParametersInfoA
sysparams.c:313:Calling SystemParametersInfoA
sysparams.c:313:Calling SystemParametersInfoA
sysparams.c:313:Calling SystemParametersInfoA
sysparams.c:313:Calling SystemParametersInfoA
sysparams.c:313:Calling SystemParametersInfoA
sysparams.c:313:Calling SystemParametersInfoA

Changelog
  Better way of handling non-existent SystemParametersInfoW
  SetLastError if GetLastError is checked after a call

Cheers,

Paul.
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