build: cache python exec path on configure

Author: legendecas

configure.py

@@ -1156,6 +1156,9 @@ def gcc_version_ge(version_checked):
       return False
   return True
 
+def configure_python(o):
+  o['variables']['python_exec_path'] = sys.executable
+
 def configure_node_lib_files(o):
   o['variables']['node_library_files'] = SearchFiles('lib', 'js')
 
@@ -1905,6 +1908,7 @@ def make_bin_override():
   flavor_params['flavor'] = options.dest_os
 flavor = GetFlavor(flavor_params)
 
+configure_python(output)
 configure_node(output)
 configure_node_lib_files(output)
 configure_napi(output)

node.gyp

@@ -790,7 +790,7 @@
               'outputs': ['<(SHARED_INTERMEDIATE_DIR)/openssl.def'],
               'process_outputs_as_sources': 1,
               'action': [
-                'python',
+                '<(python_exec_path)',
                 'tools/mkssldef.py',
                 '<@(mkssldef_flags)',
                 '-o',
@@ -816,7 +816,7 @@
             '<(SHARED_INTERMEDIATE_DIR)/node_javascript.cc',
           ],
           'action': [
-            'python',
+            '<(python_exec_path)',
             'tools/js2c.py',
             '--directory',
             'lib',