[librsvg/abderrahim/rst2man] Check for both rst2man and rst2man.py in configure.ac

[Abderrahim Kitouni <akitouni src gnome org>]

commit 1dd102822a48604c2bb3c0d8d2ca1c5c6967ff1b
Author: Abderrahim Kitouni <akitouni gnome org>
Date:   Wed Jan 5 18:49:48 2022 +0100

    Check for both rst2man and rst2man.py in configure.ac

 configure.ac | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/configure.ac b/configure.ac
index 3c6178d42..a007dda26 100644
--- a/configure.ac
+++ b/configure.ac
@@ -114,7 +114,7 @@ AX_COMPARE_VERSION([$rust_version],[lt],[$MINIMUM_RUST_VER], [
 
 dnl Man page generator
 
-AC_CHECK_TOOL(RST2MAN, [rst2man], [no])
+AC_CHECK_PROGS(RST2MAN, [rst2man rst2man.py], [no])
 AS_IF(test x$RST2MAN = xno,
     AC_MSG_ERROR([rst2man is required.  Please install python3-docutils.])
 )