Bug#972281: linux-source-5.8: Fails to compile with no LKMs if no Module.symvers

[John Talbut <jt@dpets.uk>]

Package: linux-source-5.8
Version: 5.8.10-1
Severity: serious
Tags: ftbfs
Justification: fails to build from source (but built successfully in the
past)

When compiling a static kernel (i.e. with no LKMs), which I have done
many times before, deb-pkg fails after the compiling has finished unless
the file Module.symvers is present in the source directory.  It does not
matter if the file is empty, which it will be if no modules are being used.

-- System Information:
Debian Release: bullseye/sid
  APT prefers testing
  APT policy: (500, 'testing')
Architecture: amd64 (x86_64)

Kernel: Linux 5.8.10-20201015 (SMP w/2 CPU threads)
Locale: LANG=en_GB.UTF-8, LC_CTYPE=en_GB.UTF-8 (charmap=UTF-8),
LANGUAGE=en_GB:en
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)

Versions of packages linux-source-5.8 depends on:
ii  binutils  2.35.1-1
ii  xz-utils  5.2.4-1+b1

Versions of packages linux-source-5.8 recommends:
ii  bc                    1.07.1-2+b2
ii  bison                 2:3.7.2+dfsg-1
ii  flex                  2.6.4-8
ii  gcc                   4:10.2.0-1
ii  libc6-dev [libc-dev]  2.31-3
pn  linux-config-5.8      <none>
ii  make                  4.3-4

Versions of packages linux-source-5.8 suggests:
ii  libncurses-dev [ncurses-dev]  6.2+20200918-1
pn  pkg-config                    <none>
pn  qtbase5-dev                   <none>

-- no debconf information