Add GlobWithDeps to MakeVarsContext

It is safe to use GlobWithDeps in MakeVarsContext, the globSingleton
is registered in boostrap.Main, which runs after all the Soong
singletons (including makeVarsSingleton) are registered.

Bug: 143324390
Test: m checkbuild
Change-Id: I2edf915c666bd5db535c761bb645a48c4f573a65