コメント内の画像についてのテストを修正

diff --git a/latex_mk/test/graphics_comment/latex.mk b/latex_mk/test/graphics_comment/latex.mk
new file mode 120000 (symlink)
index 0000000..5a11d14
--- /dev/null
+++ b/latex_mk/test/graphics_comment/latex.mk
@@ -0,0 +1 @@
+../../latex.mk
\ No newline at end of file