Use "Environment" instead of "Rscons::Environment" in build tests

build_tests/custom_builder/Rsconscript

@@ -10,7 +10,7 @@ EOF
 end
 
 build do
-  Rscons::Environment.new do |env|
+  Environment.new do |env|
     env.add_builder(MySource.new)
     env.MySource('inc.h', [])
     env.Program('program.exe', Dir['*.c'])

build_tests/custom_builder/build_after.rb

@@ -1,5 +1,5 @@
 build do
-  Rscons::Environment.new do |env|
+  Environment.new do |env|
     env.Command("inc.c",
                 [],
                 "CMD" => %w[ruby gen.rb ${_TARGET}],

build_tests/custom_builder/cvar_expansion.rb

@@ -10,7 +10,7 @@ EOF
 end
 
 build do
-  env = Rscons::Environment.new do |env|
+  env = Environment.new do |env|
     env["hdr"] = "inc.h"
     env["src"] = "program.c"
     env.add_builder(MySource.new)

build_tests/custom_builder/cvar_lambda.rb

@@ -10,7 +10,7 @@ EOF
 end
 
 build do
-  e1 = Rscons::Environment.new do |env|
+  e1 = Environment.new do |env|
     env.add_builder(MySource.new)
     env["one"] = "5"
     env[:cfg] = {val: "9"}

build_tests/custom_builder/multiple_targets.rb

@@ -13,7 +13,7 @@ class CHGen < Rscons::Builder
 end
 
 build do
-  Rscons::Environment.new do |env|
+  Environment.new do |env|
     env.add_builder(CHGen.new)
     env.CHGen("inc.c", ["program.c"])
     env.Program("program.exe", %w[program.c inc.c])

build_tests/custom_builder/produces.rb

@@ -1,5 +1,5 @@
 build do
-  Rscons::Environment.new do |env|
+  Environment.new do |env|
     env["build_root"] = env.build_root
     env["inc_h"] = "inc.h"