maint: fix Automake warning

* Makefile.am (prologue): Remove macro, as \# is not portable here
and Automake complains.  Replace its only use with its definiens.

diff --git a/Makefile.am b/Makefile.am
index 71414447d8543d339d0dea9e6cb0428f3562022f..12d34cda86af25004fa6f531f1aeb5b3e11e62bd 100644 (file)
--- a/Makefile.am
+++ b/Makefile.am
@@ -143,9 +143,6 @@ check-ls-dircolors:
 # 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' $(srcdir)/THANKS.in
-
 # FIXME: avoid dependency to build our own 'sort' for 'make dist' ...
 # when common platforms have a functional case-folding implementation:
 #   $ test 'abácad' = "$(printf '%s\n' 'ab' 'ác' 'ad' \
@@ -157,7 +154,7 @@ prologue = perl -ne '/^\#\#/ and exit; print' $(srcdir)/THANKS.in
 THANKS: THANKS.in Makefile.am .mailmap thanks-gen .version
        $(AM_V_GEN)rm -f $@-t $@;                                       \
        {                                                               \
-         $(prologue); echo;                                            \
+         perl -ne '/^\#\#/ and exit; print' $(srcdir)/THANKS.in; echo; \
          { perl -ne '/^$$/.../^$$/ and !/^$$/ and s/  +/\0/ and print' \
              $(srcdir)/THANKS.in;                                      \
            git log --pretty=format:'%aN%x00%aE'                        \