s/COPYING/.HEADER/ for install-headers target
s/COPYING/.HEADER/ for install-headers target

We don't want to prepend the entire license; Only the
file header part of it.

Signed-off-by: Andreas Ericsson <1eabdaf488b3a3682bbca94c5f468f065cdfaf13@op5.se>
Signed-off-by: Shawn O. Pearce <f01032651c12a22b2103346ba96b3b6b231f9d3c@spearce.org>

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