[SunOS] Compilation of _psutil_sunos.c fails with GCC 4.9.4

[vser1]

Platform

• SunOS 5.10 with GCC 4.9.4
• psutil version 5.6.4

Bug description
Compilation of _psutil_sunos.c fails with GCC 4.9.4 with the following traceback (bugfix on its way):

cc -DNDEBUG -O -xcode=pic32 -DPSUTIL_POSIX=1 -DPSUTIL_VERSION=564 -DPSUTIL_SUNOS=1 -DPSUTIL_SUNOS10=1 -I/usr/atelier/unsupported/python/v3.3.3/sunos5.10/Include -I/usr/atelier/unsupported/python/v3.3.3/sunos5.10 -c psutil/_psutil_sunos.c -o build/temp.solaris-2.10-sun4v.32bit-3.3/psutil/_psutil_sunos.o
"psutil/_psutil_sunos.c", line 1150: syntax error before or at: int
"psutil/_psutil_sunos.c", line 1151: undefined symbol: ret
"psutil/_psutil_sunos.c", line 1411: cannot recover from previous errors
cc: acomp failed for psutil/_psutil_sunos.c
error: command 'cc' failed with exit status 2