Fix compilation in MSVC
Fix compilation in MSVC

MSVC cannot substract void pointers. Go figure.

Signed-off-by: Vicent Marti <6838a7c51796da15c3e6eae80ee6aba806e8818a@gmail.com>

KTXSoftware/libgit2,KTXSoftware/libgit2,iankronquist/libgit2,mhp/libgit2,kissthink/libgit2,sygool/libgit2,sim0629/libgit2,linquize/libgit2,KTXSoftware/libgit2,claudelee/libgit2,joshtriplett/libgit2,dleehr/libgit2,mcanthony/libgit2,nokiddin/libgit2,whoisj/libgit2,jflesch/libgit2-mariadb,mcanthony/libgit2,jflesch/libgit2-mariadb,sygool/libgit2,sygool/libgit2,mhp/libgit2,whoisj/libgit2,falqas/libgit2,chiayolin/libgit2,oaastest/libgit2,mcanthony/libgit2,claudelee/libgit2,spraints/libgit2,amyvmiwei/libgit2,rcorre/libgit2,Snazz2001/libgit2,amyvmiwei/libgit2,ardumont/libgit2,Corillian/libgit2,Corillian/libgit2,amyvmiwei/libgit2,falqas/libgit2,saurabhsuniljain/libgit2,sygool/libgit2,t0xicCode/libgit2,stewid/libgit2,jflesch/libgit2-mariadb,dleehr/libgit2,whoisj/libgit2,maxiaoqian/libgit2,mingyaaaa/libgit2,nacho/libgit2,nokiddin/libgit2,Tousiph/Demo1,kenprice/libgit2,t0xicCode/libgit2,JIghtuse/libgit2,jeffhostetler/public_libgit2,jflesch/libgit2-mariadb,spraints/libgit2,maxiaoqian/libgit2,skabel/manguse,Snazz2001/libgit2,swisspol/DEMO-libgit2,since2014/libgit2,rcorre/libgit2,oaastest/libgit2,mingyaaaa/libgit2,raybrad/libit2,MrHacky/libgit2,joshtriplett/libgit2,kissthink/libgit2,chiayolin/libgit2,rcorre/libgit2,joshtriplett/libgit2,stewid/libgit2,iankronquist/libgit2,skabel/manguse,whoisj/libgit2,rcorre/libgit2,kissthink/libgit2,JIghtuse/libgit2,chiayolin/libgit2,sim0629/libgit2,KTXSoftware/libgit2,Snazz2001/libgit2,t0xicCode/libgit2,jeffhostetler/public_libgit2,falqas/libgit2,mrksrm/Mingijura,claudelee/libgit2,leoyanggit/libgit2,rcorre/libgit2,spraints/libgit2,saurabhsuniljain/libgit2,leoyanggit/libgit2,Snazz2001/libgit2,oaastest/libgit2,mcanthony/libgit2,mingyaaaa/libgit2,Tousiph/Demo1,mhp/libgit2,yongthecoder/libgit2,jamieleecool/ptest,magnus98/TEST,mrksrm/Mingijura,jamieleecool/ptest,MrHacky/libgit2,kenprice/libgit2,magnus98/TEST,evhan/libgit2,Aorjoa/libgit2_maked_lib,yongthecoder/libgit2,zodiac/libgit2.js,leoyanggit/libgit2,KTXSoftware/libgit2,kenprice/libgit2,swisspol/DEMO-libgit2,mrksrm/Mingijura,raybrad/libit2,ardumont/libgit2,linquize/libgit2,leoyanggit/libgit2,sygool/libgit2,iankronquist/libgit2,mrksrm/Mingijura,Snazz2001/libgit2,mingyaaaa/libgit2,yongthecoder/libgit2,mingyaaaa/libgit2,sim0629/libgit2,magnus98/TEST,nokiddin/libgit2,nokiddin/libgit2,iankronquist/libgit2,spraints/libgit2,MrHacky/libgit2,nokiddin/libgit2,stewid/libgit2,ardumont/libgit2,nokiddin/libgit2,amyvmiwei/libgit2,MrHacky/libgit2,maxiaoqian/libgit2,t0xicCode/libgit2,nacho/libgit2,skabel/manguse,claudelee/libgit2,dleehr/libgit2,chiayolin/libgit2,saurabhsuniljain/libgit2,Tousiph/Demo1,Snazz2001/libgit2,claudelee/libgit2,chiayolin/libgit2,amyvmiwei/libgit2,jeffhostetler/public_libgit2,skabel/manguse,sygool/libgit2,swisspol/DEMO-libgit2,ardumont/libgit2,zodiac/libgit2.js,mingyaaaa/libgit2,linquize/libgit2,yongthecoder/libgit2,iankronquist/libgit2,yongthecoder/libgit2,jeffhostetler/public_libgit2,yosefhackmon/libgit2,leoyanggit/libgit2,Aorjoa/libgit2_maked_lib,zodiac/libgit2.js,saurabhsuniljain/libgit2,swisspol/DEMO-libgit2,magnus98/TEST,mcanthony/libgit2,raybrad/libit2,Corillian/libgit2,mhp/libgit2,kenprice/libgit2,maxiaoqian/libgit2,mrksrm/Mingijura,amyvmiwei/libgit2,since2014/libgit2,falqas/libgit2,iankronquist/libgit2,saurabhsuniljain/libgit2,skabel/manguse,kenprice/libgit2,falqas/libgit2,falqas/libgit2,stewid/libgit2,mhp/libgit2,jeffhostetler/public_libgit2,ardumont/libgit2,maxiaoqian/libgit2,sim0629/libgit2,t0xicCode/libgit2,skabel/manguse,kissthink/libgit2,evhan/libgit2,yosefhackmon/libgit2,rcorre/libgit2,since2014/libgit2,oaastest/libgit2,claudelee/libgit2,kissthink/libgit2,Aorjoa/libgit2_maked_lib,since2014/libgit2,raybrad/libit2,jamieleecool/ptest,spraints/libgit2,Aorjoa/libgit2_maked_lib,JIghtuse/libgit2,JIghtuse/libgit2,swisspol/DEMO-libgit2,ardumont/libgit2,joshtriplett/libgit2,Corillian/libgit2,yosefhackmon/libgit2,JIghtuse/libgit2,linquize/libgit2,joshtriplett/libgit2,jeffhostetler/public_libgit2,dleehr/libgit2,oaastest/libgit2,JIghtuse/libgit2,stewid/libgit2,yosefhackmon/libgit2,Aorjoa/libgit2_maked_lib,oaastest/libgit2,jflesch/libgit2-mariadb,mrksrm/Mingijura,joshtriplett/libgit2,Tousiph/Demo1,Corillian/libgit2,raybrad/libit2,Tousiph/Demo1,yosefhackmon/libgit2,linquize/libgit2,sim0629/libgit2,yongthecoder/libgit2,zodiac/libgit2.js,maxiaoqian/libgit2,zodiac/libgit2.js,magnus98/TEST,swisspol/DEMO-libgit2,MrHacky/libgit2,jflesch/libgit2-mariadb,spraints/libgit2,sim0629/libgit2,kissthink/libgit2,whoisj/libgit2,chiayolin/libgit2,magnus98/TEST,dleehr/libgit2,mhp/libgit2,evhan/libgit2,nacho/libgit2,kenprice/libgit2,linquize/libgit2,stewid/libgit2,Corillian/libgit2,Tousiph/Demo1,whoisj/libgit2,nacho/libgit2,since2014/libgit2,dleehr/libgit2,KTXSoftware/libgit2,yosefhackmon/libgit2,evhan/libgit2,saurabhsuniljain/libgit2,MrHacky/libgit2,since2014/libgit2,mcanthony/libgit2,t0xicCode/libgit2,jamieleecool/ptest,leoyanggit/libgit2