depends: Delay expansion of per-package vars
depends: Delay expansion of per-package vars

Prior to this commit, when int_vars was called for packages, it would
immediately expand the "single-dollar variables", which may be defined
in terms of variables which are not yet determined (e.g. variables
defined in package/*.mk, which are included after int_vars is called).

This is required for the next commit as after that commit, for darwin
cross-builds:

0. int_vars is defined in terms of $(1)_cc
1. $(1)_cc is defined in terms of darwin_CC
2. ... which is defined in terms of clang_resource_dir
3. ... which is defined in terms of native_cctools_clang_version
4. which is undetermined at the time when int_vars is being expanded and evaluated

sipsorcery/bitcoin,anditto/bitcoin,GroestlCoin/GroestlCoin,jlopp/statoshi,sstone/bitcoin,GroestlCoin/bitcoin,namecoin/namecore,fanquake/bitcoin,practicalswift/bitcoin,achow101/bitcoin,GroestlCoin/GroestlCoin,jnewbery/bitcoin,EthanHeilman/bitcoin,particl/particl-core,MeshCollider/bitcoin,fanquake/bitcoin,lateminer/bitcoin,fujicoin/fujicoin,rnicoll/bitcoin,sipsorcery/bitcoin,pataquets/namecoin-core,fujicoin/fujicoin,EthanHeilman/bitcoin,particl/particl-core,ElementsProject/elements,instagibbs/bitcoin,fanquake/bitcoin,GroestlCoin/GroestlCoin,pataquets/namecoin-core,MeshCollider/bitcoin,namecoin/namecore,achow101/bitcoin,ajtowns/bitcoin,ajtowns/bitcoin,domob1812/namecore,namecoin/namecore,rnicoll/bitcoin,jlopp/statoshi,namecoin/namecoin-core,jambolo/bitcoin,pstratem/bitcoin,kallewoof/bitcoin,pataquets/namecoin-core,bitcoinsSG/bitcoin,AkioNak/bitcoin,mm-s/bitcoin,GroestlCoin/bitcoin,AkioNak/bitcoin,MeshCollider/bitcoin,namecoin/namecore,jlopp/statoshi,cdecker/bitcoin,cdecker/bitcoin,Xekyo/bitcoin,andreaskern/bitcoin,Xekyo/bitcoin,n1bor/bitcoin,fujicoin/fujicoin,Xekyo/bitcoin,bitcoinknots/bitcoin,mm-s/bitcoin,MarcoFalke/bitcoin,domob1812/bitcoin,lateminer/bitcoin,fanquake/bitcoin,instagibbs/bitcoin,pstratem/bitcoin,yenliangl/bitcoin,Sjors/bitcoin,lateminer/bitcoin,n1bor/bitcoin,apoelstra/bitcoin,fanquake/bitcoin,Sjors/bitcoin,rnicoll/bitcoin,achow101/bitcoin,namecoin/namecoin-core,Xekyo/bitcoin,qtumproject/qtum,prusnak/bitcoin,yenliangl/bitcoin,qtumproject/qtum,dscotese/bitcoin,AkioNak/bitcoin,jlopp/statoshi,domob1812/bitcoin,tecnovert/particl-core,practicalswift/bitcoin,bitcoinsSG/bitcoin,bitcoinknots/bitcoin,fanquake/bitcoin,jamesob/bitcoin,lateminer/bitcoin,prusnak/bitcoin,jambolo/bitcoin,ElementsProject/elements,bitcoin/bitcoin,bitcoin/bitcoin,achow101/bitcoin,MeshCollider/bitcoin,pataquets/namecoin-core,ajtowns/bitcoin,dscotese/bitcoin,apoelstra/bitcoin,andreaskern/bitcoin,kallewoof/bitcoin,jnewbery/bitcoin,yenliangl/bitcoin,namecoin/namecore,cdecker/bitcoin,jambolo/bitcoin,tecnovert/particl-core,apoelstra/bitcoin,JeremyRubin/bitcoin,MeshCollider/bitcoin,GroestlCoin/bitcoin,yenliangl/bitcoin,JeremyRubin/bitcoin,instagibbs/bitcoin,mruddy/bitcoin,cdecker/bitcoin,ElementsProject/elements,sipsorcery/bitcoin,particl/particl-core,domob1812/namecore,n1bor/bitcoin,sstone/bitcoin,mm-s/bitcoin,GroestlCoin/GroestlCoin,pataquets/namecoin-core,JeremyRubin/bitcoin,sstone/bitcoin,pstratem/bitcoin,achow101/bitcoin,Xekyo/bitcoin,anditto/bitcoin,domob1812/namecore,sstone/bitcoin,practicalswift/bitcoin,bitcoin/bitcoin,ajtowns/bitcoin,MarcoFalke/bitcoin,EthanHeilman/bitcoin,bitcoin/bitcoin,kallewoof/bitcoin,MarcoFalke/bitcoin,tecnovert/particl-core,namecoin/namecoin-core,jamesob/bitcoin,JeremyRubin/bitcoin,fujicoin/fujicoin,domob1812/bitcoin,dscotese/bitcoin,JeremyRubin/bitcoin,JeremyRubin/bitcoin,GroestlCoin/bitcoin,jambolo/bitcoin,kallewoof/bitcoin,n1bor/bitcoin,Xekyo/bitcoin,pstratem/bitcoin,yenliangl/bitcoin,dscotese/bitcoin,namecoin/namecoin-core,jambolo/bitcoin,ElementsProject/elements,GroestlCoin/GroestlCoin,bitcoinknots/bitcoin,instagibbs/bitcoin,sipsorcery/bitcoin,bitcoinsSG/bitcoin,qtumproject/qtum,bitcoin/bitcoin,prusnak/bitcoin,lateminer/bitcoin,prusnak/bitcoin,practicalswift/bitcoin,particl/particl-core,MarcoFalke/bitcoin,namecoin/namecoin-core,fujicoin/fujicoin,domob1812/namecore,n1bor/bitcoin,mm-s/bitcoin,kallewoof/bitcoin,Sjors/bitcoin,mruddy/bitcoin,cdecker/bitcoin,andreaskern/bitcoin,domob1812/namecore,bitcoinsSG/bitcoin,bitcoinsSG/bitcoin,MarcoFalke/bitcoin,achow101/bitcoin,dscotese/bitcoin,instagibbs/bitcoin,tecnovert/particl-core,GroestlCoin/bitcoin,andreaskern/bitcoin,ElementsProject/elements,jamesob/bitcoin,sstone/bitcoin,kallewoof/bitcoin,fujicoin/fujicoin,apoelstra/bitcoin,MeshCollider/bitcoin,pstratem/bitcoin,domob1812/bitcoin,AkioNak/bitcoin,qtumproject/qtum,mruddy/bitcoin,EthanHeilman/bitcoin,anditto/bitcoin,particl/particl-core,bitcoin/bitcoin,jlopp/statoshi,rnicoll/bitcoin,jamesob/bitcoin,pstratem/bitcoin,mruddy/bitcoin,sipsorcery/bitcoin,jnewbery/bitcoin,n1bor/bitcoin,anditto/bitcoin,qtumproject/qtum,ajtowns/bitcoin,domob1812/namecore,Sjors/bitcoin,andreaskern/bitcoin,rnicoll/bitcoin,pataquets/namecoin-core,instagibbs/bitcoin,practicalswift/bitcoin,tecnovert/particl-core,ElementsProject/elements,mm-s/bitcoin,jnewbery/bitcoin,jnewbery/bitcoin,bitcoinknots/bitcoin,yenliangl/bitcoin,dscotese/bitcoin,jlopp/statoshi,prusnak/bitcoin,namecoin/namecoin-core,AkioNak/bitcoin,jamesob/bitcoin,qtumproject/qtum,particl/particl-core,apoelstra/bitcoin,jambolo/bitcoin,apoelstra/bitcoin,bitcoinsSG/bitcoin,anditto/bitcoin,mruddy/bitcoin,anditto/bitcoin,sipsorcery/bitcoin,Sjors/bitcoin,mruddy/bitcoin,andreaskern/bitcoin,EthanHeilman/bitcoin,MarcoFalke/bitcoin,tecnovert/particl-core,cdecker/bitcoin,qtumproject/qtum,ajtowns/bitcoin,lateminer/bitcoin,domob1812/bitcoin,practicalswift/bitcoin,EthanHeilman/bitcoin,domob1812/bitcoin,GroestlCoin/GroestlCoin,prusnak/bitcoin,jamesob/bitcoin,bitcoinknots/bitcoin,AkioNak/bitcoin,namecoin/namecore,mm-s/bitcoin,sstone/bitcoin,GroestlCoin/bitcoin,rnicoll/bitcoin