Fix cross-compilation out-of-tree build
Fix cross-compilation out-of-tree build

Add tcc.c as a prerequesite of the %-tcc$(EXESUF) target and compile $<
instead of tcc.c to make sure tcc.c is search in directories specified
by VPATH.

seyko2/tinycc,Archs/TinyCC,fstudio/tinycc,ftdi-paul-jiao/tinyCC,avih/tinycc,melkior/tinycc,mobiphil/tinnycc,Archs/TinyCC,mingodad/tinycc,andreiw/tinycc,Archs/TinyCC,mobiphil/tinnycc,metaeducation/tcc,seyko2/tinycc,run4flat/tinycc,Saectar/inherpreter,acook/tinycc,alfonsokim/tinycc,melkior/tinycc,metaeducation/tcc,run4flat/tinycc,mingodad/tinycc,alfonsokim/tinycc,mingodad/tinycc,Saectar/inherpreter,metaeducation/tcc,andrewchambers/tccmirror,alfonsokim/tinycc,leeduhem/tinycc,Saectar/inherpreter,yousong/tinycc,melkior/tinycc,Saectar/inherpreter,Archs/TinyCC,FriedBreakfast/tcc,rchandramouli/tinycc,mobiphil/tinnycc,andrewchambers/tccmirror,ftdi-paul-jiao/tinyCC,ftdi-paul-jiao/tinyCC,rchandramouli/tinycc,alfonsokim/tinycc,gfwilliams/tinycc,avih/tinycc,seyko2/tinycc,code4game/tinycc,alfonsokim/tinycc,leeduhem/tinycc,FriedBreakfast/tcc,avih/tinycc,leeduhem/tinycc,FriedBreakfast/tcc,gfwilliams/tinycc,acook/tinycc,metaeducation/tcc,andrewchambers/tccmirror,leeduhem/tinycc,mirror/tinycc,metaeducation/tcc,yousong/tinycc,rchandramouli/tinycc,code4game/tinycc,mirror/tinycc,leeduhem/tinycc,mirror/tinycc,Saectar/inherpreter,Archs/TinyCC,seyko2/tinycc,gfwilliams/tinycc,yousong/tinycc,fstudio/tinycc,yousong/tinycc,andreiw/tinycc,rchandramouli/tinycc,andrewchambers/tccmirror,run4flat/tinycc,mingodad/tinycc,rchandramouli/tinycc,acook/tinycc,FriedBreakfast/tcc,andreiw/tinycc,gfwilliams/tinycc,acook/tinycc,run4flat/tinycc,FriedBreakfast/tcc,ftdi-paul-jiao/tinyCC,fstudio/tinycc,seyko2/tinycc,avih/tinycc,code4game/tinycc,mirror/tinycc,run4flat/tinycc,melkior/tinycc,melkior/tinycc,andrewchambers/tccmirror,mobiphil/tinnycc,gfwilliams/tinycc,fstudio/tinycc,fstudio/tinycc