BUILD: fix VERDATE exclusion regex
A backslash was missing. It used to work well with GNU grep anyway but
better fix it.
diff --git a/Makefile b/Makefile
index 0c36650..881297b 100644
--- a/Makefile
+++ b/Makefile
@@ -359,7 +359,7 @@
SUBVERS := $(shell (grep -v '\$$Format' SUBVERS 2>/dev/null || touch SUBVERS) | head -n 1)
endif
ifeq ($(VERDATE),)
-VERDATE := $(shell (grep -v '^$$Format' VERDATE 2>/dev/null || touch VERDATE) | head -n 1 | cut -f1 -d' ' | tr '-' '/')
+VERDATE := $(shell (grep -v '^\$$Format' VERDATE 2>/dev/null || touch VERDATE) | head -n 1 | cut -f1 -d' ' | tr '-' '/')
endif
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