maint: fix Automake warning

* Makefile.am (prologue): Remove macro.
(THANKS): Use the perl command directly.

diff --git a/Makefile.am b/Makefile.am
index 0f32a52ca4da654007d157ca462338c5baf4670c..c5728aef6e4ac7ecda3186719c5c2ddeee42e603 100644 (file)
--- a/Makefile.am
+++ b/Makefile.am
@@ -576,15 +576,12 @@ $(changelog): FORCE
 # current locale considers to be equal.
 ASSORT = LC_ALL=C sort
 
-# Extract all lines up to the first one starting with "##".
-prologue = perl -ne '/^\#\#/ and exit; print' $(no_thanks)
-
 # Generate THANKS using git log entries as far as possible, fixing
 # up omissions and errors from NO-THANKS configuration.
 $(thanks): FORCE
        $(AM_V_GEN)if test -d '$(srcdir)/.git'; then \
          { \
-           $(prologue); echo; \
+           perl -ne '/^\#\#/ and exit; print' $(no_thanks); echo; \
            { perl -ne '/^$$/.../^$$/ and print' $(no_thanks) \
              | grep -v '^$$' | perl -pe 's/  +/\0/'; \
              {  sed -e '1,/\#\# /d' -e '/^\#\# /d' \