[repacker] add repacker isolation test on real font.

test/subset/data/repack_tests/Makefile.sources

@@ -2,6 +2,7 @@ TESTS = \
 	basic.tests \
 	prioritization.tests \
 	table_duplication.tests \
+        isolation.tests \
 	$(NULL)
 
 XFAIL_TESTS = \

test/subset/data/repack_tests/isolation.tests

@@ -0,0 +1,96 @@
+NotoNastaliqUrdu-Regular.ttf
+0x0020
+0x060b
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test/subset/meson.build

@@ -46,6 +46,7 @@ repack_tests = [
   'basic',
   'prioritization',
   'table_duplication',
+  'isolation',
 ]