python3: disable debug build, drop testsuit

* turns out exportig OPT var disables debug build
* drop testsuite as it takes a lot of space, perhaps needs to be moved into a separate package
* should we drop __pycache__ as well?

Used https://git.centos.org/blob/rpms!rh-python36-python.git/c7/SPECS!python.spec#L1484
and https://packages.debian.org/source/buster/python3.6 as a reference

dev-lang/python/python3-3.6.3.recipe

@@ -99,6 +99,7 @@ BUILD()
 	libtoolize --force --copy --install
 	aclocal
 	autoconf
+	export OPT=""
 	runConfigure --omit-dirs binDir,includeDir ./configure \
 		--enable-shared --without-ensurepip \
 		--with-system-expat --bindir=$commandBinDir --includedir=$developDir/headers
@@ -130,6 +131,14 @@ INSTALL()
 
 	mkdir -p $prefix/non-packaged/lib/python3.6
 	mv $prefix/lib/python3.6/site-packages $prefix/non-packaged/lib/python3.6/
+
+	# drop testsuite altogether; move to a separate package if needed
+	cd $prefix/lib/python3.6
+	rm -rf ctypes/test distutils/tests idlelib/idle_test lib2to3/tests \
+		sqlite3/test test tkinter/test unittest/test
+
+	# TODO: drop __pycache__ folders as well?
+	find . -name __pycache__ | xargs rm -rf
 }
 
 TEST()