Fix for nodes in foreach

In the code:

```
\draw (A) foreach \nd in {B,C} { -- (\nd) };
```
then the line to `C` is drawn from `A`, not `B`.  This is because the
foreach loop does not update the macro that remembers that the last
coordinate was a node.  This fixes that issue.

See pgf-tikz#1303

Signed-off-by: Andrew Stacey <loopspace@mathforge.org>

tex/generic/pgf/frontendlayer/tikz/tikz.code.tex

@@ -2582,6 +2582,7 @@
 
 \def\tikz@foreach{%
   \def\pgffor@beginhook{%
+    \global\let\tikz@moveto@waiting\tikz@foreach@moveto@waiting%
     \tikz@lastx=\tikz@foreach@save@lastx%
     \tikz@lasty=\tikz@foreach@save@lasty%
     \tikz@lastxsaved=\tikz@foreach@save@lastxsaved%
@@ -2590,6 +2591,7 @@
     \setbox\tikz@figbox@bg=\box\tikz@tempbox@bg%
     \expandafter\tikz@scan@next@command\pgfutil@firstofone}%
   \def\pgffor@endhook{\pgfextra{%
+      \global\let\tikz@foreach@moveto@waiting\tikz@moveto@waiting%
       \xdef\tikz@foreach@save@lastx{\the\tikz@lastx}%
       \xdef\tikz@foreach@save@lasty{\the\tikz@lasty}%
       \xdef\tikz@foreach@save@lastxsaved{\the\tikz@lastxsaved}%
@@ -2598,6 +2600,7 @@
       \global\setbox\tikz@tempbox@bg=\box\tikz@figbox@bg%
       \pgfutil@gobble}}%
   \def\pgffor@afterhook{%
+    \let\tikz@moveto@waiting\tikz@foreach@moveto@waiting%
     \tikz@lastx=\tikz@foreach@save@lastx%
     \tikz@lasty=\tikz@foreach@save@lasty%
     \tikz@lastxsaved=\tikz@foreach@save@lastxsaved%
@@ -2614,6 +2617,7 @@
   \xdef\tikz@foreach@save@lasty{\the\tikz@lasty}%
   \xdef\tikz@foreach@save@lastxsaved{\the\tikz@lastxsaved}%
   \xdef\tikz@foreach@save@lastysaved{\the\tikz@lastysaved}%
+  \global\let\tikz@foreach@moveto@waiting\tikz@moveto@waiting%
   \foreach}%