Use python3 instead of python

This fixes a few stragglers after 6a17e84

CMakeLists.txt

@@ -90,7 +90,7 @@ function(check_platform_supports_browse_mode RESULT)
 
 endfunction()
 
-set(NINJA_PYTHON "python" CACHE STRING "Python interpreter to use for the browse tool")
+set(NINJA_PYTHON "python3" CACHE STRING "Python interpreter to use for the browse tool")
 
 check_platform_supports_browse_mode(platform_supports_ninja_browse)
 
@@ -240,6 +240,10 @@ if(BUILD_TESTING)
     manifest_parser_perftest
   )
     add_executable(${perftest} src/${perftest}.cc)
+    set_source_files_properties(src/${perftest}.cc
+      PROPERTIES
+        COMPILE_DEFINITIONS NINJA_PYTHON="${NINJA_PYTHON}"
+    )
     target_link_libraries(${perftest} PRIVATE libninja libninja-re2c)
   endforeach()
 

misc/ninja_syntax.py

@@ -1,5 +1,3 @@
-#!/usr/bin/python
-
 # Copyright 2011 Google Inc. All Rights Reserved.
 #
 # Licensed under the Apache License, Version 2.0 (the "License");

misc/write_fake_manifests.py

@@ -6,7 +6,7 @@
 ones used in the Chromium project.
 
 Usage:
-  python misc/write_fake_manifests.py outdir  # Will run for about 5s.
+  python3 misc/write_fake_manifests.py outdir  # Will run for about 5s.
 
 The program contains a hardcoded random seed, so it will generate the same
 output every time it runs.  By changing the seed, it's easy to generate many

src/manifest_parser_perftest.cc

@@ -48,7 +48,7 @@ bool WriteFakeManifests(const string& dir, string* err) {
   if (mtime != 0)  // 0 means that the file doesn't exist yet.
     return mtime != -1;
 
-  string command = "python misc/write_fake_manifests.py " + dir;
+  string command = NINJA_PYTHON " misc/write_fake_manifests.py " + dir;
   printf("Creating manifest data..."); fflush(stdout);
   int exit_code = system(command.c_str());
   printf("done.\n");