corretta data commit autoinserita

Makefile

@@ -12,6 +12,7 @@ booklet: build/main.pdf
 build/%.pdf: %.tex $(RASTF) Makefile
 	@mkdir -p build
 	@git rev-parse HEAD | dd bs=1 count=10 > build/commit.tex
+	@git log -1 --format=%ci | cut -d' ' -f1 > build/commit-date.tex
 	@status=$$(git status --porcelain); if test "x$${status}" != x; then echo " dirty" >> build/commit.tex; fi
 	@if [ -t 1 ]; then echo -e "\033[1;33m[Mashup      ]\033[0m main.tex"; else echo "Mashup"; fi
 	@pdflatex -output-directory build -synctex=1 -interaction=nonstopmode $<

main.tex

@@ -85,7 +85,7 @@ Questo manualetto è stato preparato da:\\
 GOLEM - Gruppo Operativo Linux Empoli\\
 via Magolo, 32 - 50053 Empoli (FI)\\
 golem.linux.it\\
-Revisione \texttt{\input{build/commit}} del \texttt{\today}
+Revisione \texttt{\input{build/commit}} del \texttt{\input{build/commit-date.tex}}, compilata il \texttt{\today}
 \end{minipage}
 \begin{minipage}{.2\textwidth}
   \centering