fix escaping of brackets for m4 broken in b6b2149

Author: adunstan

config/python.m4

@@ -45,7 +45,7 @@ if a == b:
 else:
     print(a + ' ' + b)"`
 if test "$PORTNAME" = win32 ; then
-    python_includespec=`echo $python_includespec | sed 's,[\],/,g'`
+    python_includespec=`echo $python_includespec | sed 's,[[\]],/,g'`
 fi
 AC_MSG_RESULT([$python_includespec])
 

configure

@@ -7488,7 +7488,7 @@ if a == b:
 else:
     print(a + ' ' + b)"`
 if test "$PORTNAME" = win32 ; then
-    python_includespec=`echo $python_includespec | sed 's,\,/,g'`
+    python_includespec=`echo $python_includespec | sed 's,[\],/,g'`
 fi
 { $as_echo "$as_me:${as_lineno-$LINENO}: result: $python_includespec" >&5
 $as_echo "$python_includespec" >&6; }