Update build step accounting to only count within one environment process run

spec/build_tests_spec.rb

@@ -2641,7 +2641,7 @@ EOF
       ])
     end
 
-    it "does include install targets in build progress when doing an install" do
+    it "counts install task targets separately from build task targets" do
       test_dir "typical"
 
       Dir.mktmpdir do |prefix|
@@ -2651,25 +2651,25 @@ EOF
         result = run_rscons(args: %w[-f install.rb install])
         expect(result.stderr).to eq ""
         verify_lines(lines(result.stdout), [
-          %r{\[1/9\] Compiling},
-          %r{\[2/9\] Compiling},
-          %r{\[\d/9\] Install},
+          %r{\[1/3\] Compiling},
+          %r{\[2/3\] Compiling},
+          %r{\[\d/6\] Install},
         ])
       end
     end
 
-    it "includes build steps from all environments when showing build progress" do
+    it "separates build steps from each environment when showing build progress" do
       test_dir "typical"
 
       result = run_rscons(args: %w[-f multiple_environments.rb])
       expect(result.stderr).to eq ""
       verify_lines(lines(result.stdout), [
-        %r{\[1/6\] Compiling},
-        %r{\[2/6\] Compiling},
-        %r{\[3/6\] Linking},
-        %r{\[4/6\] Compiling},
-        %r{\[5/6\] Compiling},
-        %r{\[6/6\] Linking},
+        %r{\[1/3\] Compiling},
+        %r{\[2/3\] Compiling},
+        %r{\[3/3\] Linking},
+        %r{\[1/3\] Compiling},
+        %r{\[2/3\] Compiling},
+        %r{\[3/3\] Linking},
       ])
     end
   end