maint: suppress echoing of sc_THANKS_in_duplicates implementation

* cfg.mk (sc_THANKS_in_duplicates): Suppress the echoing of these
commands run during `make syntax-check`

diff --git a/cfg.mk b/cfg.mk
index d14db043ebbd5ac5284268842d89ceee6029a201..de05c4b7cdf0a81bf3d39deb12c7b29b2eed5e36 100644 (file)
--- a/cfg.mk
+++ b/cfg.mk
@@ -420,7 +420,7 @@ sc_preprocessor_indentation:
 # someone who was initially listed only in THANKS.in later authors a commit,
 # this rule detects that their pair may now be removed from THANKS.in.
 sc_THANKS_in_duplicates:
-       { git log --pretty=format:%aN | sort -u;                        \
+       @{ git log --pretty=format:%aN | sort -u;                       \
            cut -b-36 THANKS.in | sed '/^$$/d;s/  *$$//'; }             \
          | sort | uniq -d | grep .                                     \
            && { echo '$(ME): remove the above names from THANKS.in'    \