ChangeLog, MCONFIG.in, configure.in, configure:

ChangeLog, MCONFIG.in, configure.in, configure:
  MCONFIG.in (BUILD_CC):
  configure.in (BUILD_CC): If cross compiling, find the native C
  	compiler and set it to BUILD_CC so that we can successfully build
  	util/subst.
ChangeLog, Makefile.in:
  Makefile.in (subst): Build subst using $(BUILD_CC), since it's a
  	helper program which must be built using the native C compiler during
  	a cross-compilation.
Makefile.in:
  Update dependencies.