Makefile syntax highlight bug, improper function colorization in dependency list

[aeschli]

From @Leedehai on June 21, 2017 0:4

• VSCode Version: 1.13.1
• OS Version: macOS 10.12.5

Steps to Reproduce:
In this Makefile snippet's dependency list, if the variable $(T_AUX_MESSAGES_DRIVER_SRC) is put before the function call $(addprefix $(T_PROJ_SRC_DIR), $(...) $(...)), then "addprefix" is not properly colorized.

If I change the order, "addprefix" colorization is fine.

This bug might be present with other functions as well, like "patsubst", but I didn't try..

Copied from original issue: microsoft/vscode#29148

[fadeevab]

This issue is fixed in pull request: #15