Makefile: fix docutils commands call if extension is stripped

Looks like some distribution strip the extensions of the python commands and
some don't. Try to find the correct commands by ourself.

Reported-by: Sebastian Spaeth <Sebastian@SSpaeth.de>
Reviewed-by: Sebastian Spaeth <Sebastian@SSpaeth.de>
Signed-off-by: Nicolas Sebrecht <nicolas.s-dev@laposte.net>

Changelog.draft.rst

@@ -19,6 +19,8 @@ Changes
 Bug Fixes
 ---------
 
+* Makefile: docutils: work whether python extension is stripped or not
+
 
 Pending for the next major release
 ==================================

Makefile

@@ -18,6 +18,7 @@
 VERSION=4.0.16
 TARGZ=offlineimap_$(VERSION).tar.gz
 SHELL=/bin/bash
+RST2HTML=`type rst2html 2>/dev/null && echo rst2html || echo rst2html.py`
 
 all: build
 
@@ -44,9 +45,9 @@ man:
 
 doc:
 	@$(MAKE) -C docs
-	rst2html.py README.rst readme.html
-	rst2html.py SubmittingPatches.rst SubmittingPatches.html
-	rst2html.py Changelog.rst Changelog.html
+	$(RST2HTML) README.rst readme.html
+	$(RST2HTML) SubmittingPatches.rst SubmittingPatches.html
+	$(RST2HTML) Changelog.rst Changelog.html
 
 targz: ../$(TARGZ)
 ../$(TARGZ):

docs/Makefile

@@ -5,18 +5,20 @@ SOURCES = $(wildcard *.rst)
 HTML_TARGETS = $(patsubst %.rst,%.html,$(SOURCES))
 
 RM = rm
+RST2HTML=`type rst2html 2>/dev/null && echo rst2html || echo rst2html.py`
+RST2MAN=`type rst2man 2>/dev/null && echo rst2man || echo rst2man.py`
 
 all: html
 
 html: $(HTML_TARGETS)
 
 $(HTML_TARGETS): %.html : %.rst
-	rst2html.py $? $@
+	$(RST2HTML) $? $@
 
 man: offlineimap.1
 
 offlineimap.1: MANUAL.rst
-	rst2man.py MANUAL.rst offlineimap.1
+	$(RST2MAN) MANUAL.rst offlineimap.1
 	cp -f offlineimap.1 ..
 
 clean: