refdb_fs: store "cannot be peeled" flag for packed refs
refdb_fs: store "cannot be peeled" flag for packed refs

Fixes #1532

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