Thanks to @unman and @marmarek for suggesting the fix!
Fixes https://github.com/QubesOS/qubes-issues/issues/1128.
- Changed 'ifeq (1,${DEBIANBUILD})' to 'ifeq ($(shell lsb_release -is), Debian)' to make the build work outside of Qubes Builder as well.
- Use copy-in for debian-quilt package in Makefile.builder instead of hook (to be removed) in Makefile.debian
- Remove patches from debian/patches; they are now applied dynamicly from series-debian-vm.conf
Applied patch to qrexec Makefile to prevent compile failure on warnings
qrexec: Disable all warnings being treated as errors
gcc -g -O2 -fstack-protector-strong -Wformat -Werror=format-security -I. -g -Wall -Wextra -Werror -pie -fPIC `pkg-config --cflags vchan-xen` -D_FORTIFY_SOURCE=2 -c -o qrexec-agent-data.o qrexec-agent-data.c
qrexec-agent-data.c: In function 'handle_remote_data':
qrexec-agent-data.c:217:17: error: dereferencing type-punned pointer will break strict-aliasing rules [-Werror=strict-aliasing]
status = *(unsigned int *)buf;
^
cc1: all warnings being treated as errors
<builtin>: recipe for target 'qrexec-agent-data.o' failed
