bpo-37705: Remove orphaned PC/errmap.mak (GH-29724)

After GH-15623 deleted `generrmap.c`, a related mak-file stopped working. The mak contains generrmap-related rules only so it should be removed altogether.

Further search for `errmap\.mak|generrmap` regex through content of CPython files shows no dangling reference left.

Since generrmap is already effectively removed, this pull request contains no blurp.

diff --git a/PC/errmap.mak b/PC/errmap.mak
deleted file mode 100644 (file)
index 646bcd0..0000000
--- a/PC/errmap.mak
+++ /dev/null
@@ -1,5 +0,0 @@
-errmap.h:      generrmap.exe
-       .\generrmap.exe > errmap.h
-
-genermap.exe:  generrmap.c
-       cl generrmap.c