ap2-python: Adjust optimization to be consistent with other Python packages

setup.py is invoked internally hardcoding `--optimize 2' that leads to PLIST
mismatches when Python 3 is used.  Substitute it to `--optimize 1' to be
consistent with other Python packages.

Index: Makefile
===================================================================
RCS file: /cvsroot/pkgsrc/www/ap2-python/Makefile,v
retrieving revision 1.35
diff -u -p -r1.35 Makefile
--- Makefile	1 Jan 2018 10:23:07 -0000	1.35
+++ Makefile	21 Nov 2019 11:14:51 -0000
@@ -20,6 +20,12 @@ GNU_CONFIGURE=		yes
 CONFIGURE_ARGS+=	--with-apxs=${APXS:Q}
 CONFIGURE_ARGS+=	--with-python=${PYTHONBIN:Q}
 
+SUBST_CLASSES+=			optimization
+SUBST_STAGE.optimization=	pre-configure
+SUBST_MESSAGE.optimization=	Adjust optimization
+SUBST_FILES.optimization=	dist/Makefile.in
+SUBST_SED.optimization=		-e 's,--optimize 2,--optimize 1,g'
+
 INSTALLATION_DIRS+=	bin
 PY_PATCHPLIST=		yes