[22246][PATCH] Fix tip-of-the-day with gcc-4.7

When making the text file tips-of-the-day, GnuCash expects 'gcc -E' to
preserve at least one of the whitespace lines between entries. However, this
relies on behavior of 'gcc -E' that isn't actually part of the spec, and is
a historical accident. And it changed in gcc-4.7, such that all the
whitespace is removed.

Work around this by explicitly adding a newline in the sed expression.

Pre gcc-4.7 there will be two newlines between tips, but this has no impact
on the tip displaying code.

Patch by Bill Nottingham

git-svn-id: svn+ssh://svn.gnucash.org/repo/gnucash/branches/2.4@22247 57a11ea4-9604-0410-9ed3-97b8803252fd

doc/Makefile.am

@@ -52,7 +52,7 @@ gnucash.1: gnucash.1.in Makefile
 tip_of_the_day.list: tip_of_the_day.list.in Makefile
 	${CC} -E -P -x c -D'N_(x)=x' -o $@.tmp $<
 	cat -s $@.tmp | ${SED} -e 's/^ *"//' \
-	                       -e 's/" *$$//' \
+	                       -e 's/" *$$/\n/' \
 	                       -e 's/"* *[|] */|/' \
                            -e 's:@-GNUCASH_LATEST_STABLE_SERIES-@:${GNUCASH_LATEST_STABLE_SERIES}:g' > $@
 	rm -f $@.tmp