Simplify allowing warnings during ARM build

RHEL8 Sphinx does not support all features used in ARM building. But
with few emitted warnings it can build the documentation fine. Simplify
warnings acceptance by allowing make doc SPHINX_W=''.

(cherry picked from commit 3db7e241d25e7c6d50c7a8a26c84e84c0f7344c7)

diff --git a/doc/man/Makefile.in b/doc/man/Makefile.in
index db25228aa71976ae098ce66b7736b55519e97217..75794f77413f5549a4c0a65ae874f0475fcfabcf 100644 (file)
--- a/doc/man/Makefile.in
+++ b/doc/man/Makefile.in
@@ -158,9 +158,10 @@ BIND9_VERSIONSTRING=@BIND9_VERSIONSTRING@
 # You can set these variables from the command line.
 SPHINXBUILD = @SPHINX_BUILD@
 SPHINXBUILDDIR = ${builddir}/_build
+SPHINX_W = -W
 
 common_SPHINXOPTS =            \
-       -W                      \
+       $(SPHINX_W)             \
        -a                      \
        -v                      \
        -c "${abs_srcdir}"