ws2_32: fix compiling with mingw

[Stefan Leichter]

Hello,

cross compiling ws2_32_test.exe from current git fails with:

make: Entering directory `/usr/src/wine/wine-mingw/dlls/ws2_32/tests'
i586-mingw32msvc-gcc protocol.o sock.o    testlist.o  -o 
ws2_32_test.exe -lws2_32 -lkernel32
sock.o: In function 
`test_gethostbyname_hack':/usr/src/wine/wine-mingw/dlls/ws2_32/tests/../../../../wine-git/dlls/ws2_32/tests/sock.c:1781: 
undefined reference to `_gethostname'
collect2: ld returned 1 exit status
make: *** [ws2_32_test.exe] Fehler 1
make: Leaving directory `/usr/src/wine/wine-mingw/dlls/ws2_32/tests'

This patch fixes the problem for me
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