Remove warning as errors for sphinx and remove the sphinx version tag

Signed-off-by: Steve Pham <[email protected]>

package-system/python/darwin_x64/open3d_python.patch

@@ -104,3 +104,38 @@ index 8f33537..dad3d0c 100755
 
      rsrcDir = os.path.join(pkgroot, 'Resources')
 
+diff --git a/Doc/Makefile b/Doc/Makefile
+index 4188f88..324acc4 100644
+--- a/Doc/Makefile
++++ b/Doc/Makefile
+@@ -12,7 +12,7 @@ JOBS         = auto
+ PAPER        =
+ SOURCES      =
+ DISTVERSION  = $(shell $(PYTHON) tools/extensions/patchlevel.py)
+-SPHINXERRORHANDLING = -W
++SPHINXERRORHANDLING =
+
+ # Internal variables.
+ PAPEROPT_a4     = -D latex_elements.papersize=a4paper
+diff --git a/Doc/requirements.txt b/Doc/requirements.txt
+index f43ce2c..2578393 100644
+--- a/Doc/requirements.txt
++++ b/Doc/requirements.txt
+@@ -3,13 +3,13 @@
+ # Sphinx version is pinned so that new versions that introduce new warnings
+ # won't suddenly cause build failures. Updating the version is fine as long
+ # as no warnings are raised by doing so.
+-sphinx==3.4.3
++sphinx
+ # Docutils version is pinned to a version compatible with Sphinx
+ # version <3.5.4. It can be removed after bumping Sphinx version to at
+ # least 3.5.4.
+-docutils==0.17.1
++docutils
+ # Jinja version is pinned to a version compatible with Sphinx version <4.5.
+-jinja2==3.0.3
++jinja2
+
+ blurb
+
+