[cantarell-fonts: 1/2] only remove overlaps with pathops if this is available

[Nikolaus Waxweiler <nwaxweiler src gnome org>]

commit 8c1d2203259170d29592529f89e0e2e1c23881fc
Author: Fabian Greffrath <fabian greffrath com>
Date:   Thu Dec 9 22:10:15 2021 +0100

    only remove overlaps with pathops if this is available
    
    Fixes #55

 scripts/make-static-fonts.py | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)
---
diff --git a/scripts/make-static-fonts.py b/scripts/make-static-fonts.py
index 6f500fe7..23e1e7f3 100644
--- a/scripts/make-static-fonts.py
+++ b/scripts/make-static-fonts.py
@@ -12,6 +12,11 @@ import ufo2ft
 
 import instantiator
 
+try:
+    import pathops
+    have_pathops = True
+except ImportError:
+    have_pathops = False
 
 def generate_and_write_autohinted_instance(
     instantiator: instantiator.Instantiator,
@@ -31,7 +36,7 @@ def generate_and_write_autohinted_instance(
     instance_font = ufo2ft.compileOTF(
         instance,
         removeOverlaps=True,
-        overlapsBackend="pathops",
+        overlapsBackend="pathops" if have_pathops else "booleanOperations",
         inplace=True,
         useProductionNames=True,
         optimizeCFF=ufo2ft.CFFOptimization.NONE,