Fix compilation with GNU Make 3.82 (patch from Nixpkgs).

diff --git a/Makefile b/Makefile
index 09fb3ed..59eba16 100644
--- a/Makefile
+++ b/Makefile
@@ -174,7 +174,7 @@ INSTALL := $(BINFILES) $(MANFILES)
 # want this rule first, use := on ALL, and ALL not filled in yet
 all: do_all
 
--include */module.mk
+-include proc/module.mk ps/module.mk
 
 do_all:    $(ALL)
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<div class='path'>path: <a href='/guix/log/?id=18d6173214eb82781b36d041bab99494c653f979'>root</a>/<a href='/guix/log/tests?id=18d6173214eb82781b36d041bab99494c653f979'>tests</a>/<a href='/guix/log/tests/status.scm?id=18d6173214eb82781b36d041bab99494c653f979'>status.scm</a></div><div class='content'><table class='list nowrap'><tr class='nohover'><th class='left'>Age</th><th class='left'>Commit message (<a href='/guix/log/tests/status.scm?id=18d6173214eb82781b36d041bab99494c653f979&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2022-06-26 23:19:14 +0200'>2022-06-26</span></td><td><a href='/guix/commit/tests/status.scm?id=f99f00fc814a3e1a3e1cedb5059c896e3303677c'>status: Relay "updating substitutes" messages.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2022-06-26 23:19:13 +0200'>2022-06-26</span></td><td><a href='/guix/commit/tests/status.scm?id=c31605b58228dbd10c819311a17341a22c9e5118'>status: Change tests from SRFI-11 to SRFI-71.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>