Remove unnecessary name after struct

[depau]

Hello,
This fixes the following build issue:

[Link (Dynamic)]
/usr/bin/ld: wpiExtensions.o:(.bss+0x408): multiple definition of `comDat'; drcNet.o:(.bss+0x400): first defined here
collect2: error: ld returned 1 exit status
make: *** [Makefile:143: libwiringPi.so.2.46] Error 1

comDat looks like an incomplete typedef but it actually declares a global variable. Twice, since it's included both in wpiExtensions.c and drcNet.c, which makes the build fail.

This removes the unneeded global var.

[FerGT50]

Probably related to
#32 (comment)

[AndreiCherniaev]

Probably related to
#32 (comment)

Solution #35