Various small fixes to 4.6.2-pre1

[Vladimir Nadvornik]

Hi,

Here are small patches that fixes various issues with 4.6.2-pre1.

mc-getpwuid.patch - prevents a crash if getpwuid returns NULL
mc-NULL.patch - fixes various compiler warnings about NULL-terminated 
argument lists and format strings.
mc-syntax-hpp.patch - enables syntax hilight for hpp files


Vladimir Nadvornik
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