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

build_tests/configure/check_c_header_no_fail_set_define.rb

@@ -3,7 +3,7 @@ configure do
 end
 
 build do
-  Rscons::Environment.new(echo: :command) do |env|
+  Environment.new(echo: :command) do |env|
     env.Object("simple.o", "simple.c")
   end
 end

build_tests/configure/check_c_header_success_set_define.rb

@@ -3,7 +3,7 @@ configure do
 end
 
 build do
-  Rscons::Environment.new(echo: :command) do |env|
+  Environment.new(echo: :command) do |env|
     env.Object("simple.o", "simple.c")
   end
 end

build_tests/configure/check_cfg.rb

@@ -3,7 +3,7 @@ configure do
 end
 
 build do
-  Rscons::Environment.new(echo: :command) do |env|
+  Environment.new(echo: :command) do |env|
     env.Program("myconfigtest", "simple.c")
   end
 end

build_tests/configure/check_cfg_package.rb

@@ -3,7 +3,7 @@ configure do
 end
 
 build do
-  Rscons::Environment.new(echo: :command) do |env|
+  Environment.new(echo: :command) do |env|
     env.Program("myconfigtest", "simple.c")
   end
 end

build_tests/configure/multiple_set_define.rb

@@ -4,7 +4,7 @@ configure do
 end
 
 build do
-  Rscons::Environment.new(echo: :command) do |env|
+  Environment.new(echo: :command) do |env|
     env.Object("simple.o", "simple.c")
   end
 end