FIX: symbol entry structure is incorrect
FIX: symbol entry structure is incorrect

Reference:
https://bitbucket.org/europeanspallationsource/m-epics-twincat-ads/src/24f81b23c52355ea0088bebd509680470e5f24b5/adsApp/src/adsAsynPortDriverUtils.h?at=master#lines-110

c_ulong is 8 bytes on 64-bit OSX

MrLeeh/pyads