K 10
svn:author
V 4
manu
K 8
svn:date
V 27
2020-06-11T15:25:01.171397Z
K 7
svn:log
V 411
vkquake: Fix build when having no X11 deps

When building with no X11 in all the ports vkquake can't find the vulkan_core.h
header. This is because no dependency add /usr/local/include to the CFLAGS.
Fix this by adding setting VULKAN_SDK to ${LOCALBASE}, the Makefile in the Quake
directory will add the proper CFLAGS.

Approved by:	Greg V (maintainer)
Differential Revision:	https://reviews.freebsd.org/D25233

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