configure does not check for python header and serialized make file

Hi,

I'm using omniORB 4.3 on debian buster and found out that if you don't
have the python headers, on debian the *python*-dev packages, installed
configure passes but you get a compile error later on like

cd /src/tool/omniidl
make

g++ -c -O2 -Wall -Wno-unused -fexceptions  -I/usr/include/python2.7
-DPYTHON_INCLUDE="<Python.h>" -DPYTHON_THREAD_INC="<pythread.h>"
-DIDLMO
DULE_VERSION="\"0x2630\"" -fPIC -I. -I. -I../../../../include
-I../../../../include -D__OSVERSION__=2 -D__linux__ -D__x86_64__ -o
idlpython.
o idlpython.cc
<command-line>: fatal error: Python.h: Datei oder Verzeichnis nicht
gefunden

I would expect that configure checks that. My favourite solution would
be that I can turn python support off, as getting omniORB compiled on 
odd platforms (Windows) is a pain anyway and not requiring python would
help.

One a related note I was also not able to speedup compilation via

make -j 12

it just compiled on single core which made debugging that issue quite
long.

I'm with tango-controls if that matters.

Thanks,
Thomas