pgen lives in Parser, not Programs.

Apparently, I can't read.
diff --git a/.gitignore b/.gitignore
index dde654b..9606f0f 100644
--- a/.gitignore
+++ b/.gitignore
@@ -34,7 +34,6 @@
 Programs/_freeze_importlib.exe
 Programs/_testembed
 Programs/_testembed.exe
-Programs/pgen.exe
 PC/python_nt*.h
 PC/pythonnt_rc*.h
 PC/*/*.exe
@@ -60,6 +59,7 @@
 PCBuild/win32/
 .purify
 Parser/pgen
+Parser/pgen.exe
 __pycache__
 autom4te.cache
 build/