Add graphicx.tex to make documentation easier to build.

src/graphicx.tex

@@ -0,0 +1,13 @@
+% Plain TeX interface to graphicx package.
+% David Carlisle
+
+
+\input miniltx
+
+\def\Gin@driver{dvips.def}
+\input graphicx.sty
+
+
+\resetatcatcode
+
+