No more globals.hh in headers

This is needed to rearrange include order, but I also think it is a good
thing anyways, as we seek to reduce the use of global settings variables
over time.

src/libexpr/eval-cache.cc

@@ -4,6 +4,7 @@
 #include "nix/expr/eval.hh"
 #include "nix/expr/eval-inline.hh"
 #include "nix/store/store-api.hh"
+#include "nix/store/globals.hh"
 // Need specialization involving `SymbolStr` just in this one module.
 #include "nix/util/strings-inline.hh"
 

src/libexpr/eval.cc

@@ -6,6 +6,7 @@
 #include "nix/util/exit.hh"
 #include "nix/util/types.hh"
 #include "nix/util/util.hh"
+#include "nix/util/environment-variables.hh"
 #include "nix/store/store-api.hh"
 #include "nix/store/derivations.hh"
 #include "nix/store/downstream-placeholder.hh"

src/libexpr/primops.cc

@@ -5,6 +5,7 @@
 #include "nix/expr/eval-settings.hh"
 #include "nix/expr/gc-small-vector.hh"
 #include "nix/expr/json-to-value.hh"
+#include "nix/store/globals.hh"
 #include "nix/store/names.hh"
 #include "nix/store/path-references.hh"
 #include "nix/store/store-api.hh"

src/libexpr/primops/context.cc

@@ -2,6 +2,7 @@
 #include "nix/expr/eval-inline.hh"
 #include "nix/store/derivations.hh"
 #include "nix/store/store-api.hh"
+#include "nix/store/globals.hh"
 
 namespace nix {
 

src/libexpr/primops/fetchClosure.cc

@@ -3,6 +3,7 @@
 #include "nix/store/realisation.hh"
 #include "nix/store/make-content-addressed.hh"
 #include "nix/util/url.hh"
+#include "nix/util/environment-variables.hh"
 
 namespace nix {