Trac #33143: Matplotlib update breaks build on debian buster

#31580 or #33040 broke sage build on debian buster:

{{{
[matplotlib-3.5.1]   gcc -DNDEBUG -g -fwrapv -O2 -Wall -march=native -O3
-g -Wdate-time -D_FORTIFY_SOURCE=2 -fPIC -DMPL_DEVNULL=/dev/null
-DPY_ARRAY_UNIQUE_SYMBOL=MPL_matplotlib__$
hull_ARRAY_API -DNPY_NO_DEPRECATED_API=NPY_1_7_API_VERSION
-D__STDC_FORMAT_MACROS=1 -I/srv/public/kliem/sage/local/var/lib/sage
/venv-python3.7/lib/python3.7/site-packages/numpy/co$
e/include -I/srv/public/kliem/sage/local/var/lib/sage/venv-
python3.7/include -I/usr/include/python3.7m -c src/qhull_wrap.cpp -o
build/temp.linux-x86_64-3.7/matplotlib._qhull/src/q$
ull_wrap.o
[matplotlib-3.5.1]   src/qhull_wrap.cpp:19:10: fatal error:
libqhull_r/qhull_ra.h: No such file or directory
[matplotlib-3.5.1]    #include "libqhull_r/qhull_ra.h"
}}}

URL: https://trac.sagemath.org/33143
Reported by: gh-kliem
Ticket author(s): Matthias Koeppe
Reviewer(s): Jonathan Kliem

Author: Release Manager

build/pkgs/qhull/spkg-configure.m4

@@ -19,8 +19,11 @@ SAGE_SPKG_CONFIGURE([qhull], [
                ], [
                   AC_MSG_RESULT([no. Install qhull])
                   sage_spkg_install_qhull=yes
-               ]) dnl CHECK_HEADER
-     ]) dnl COMPARE_VERSION
+               ]), dnl CHECK_HEADER
+           ], [
+               AC_MSG_RESULT([no. Install qhull])
+               sage_spkg_install_qhull=yes
+           ]) dnl AX_COMPARE_VERSION
     ]) dnl IF
     m4_popdef([SAGE_QHULL_MINVER])
 ])