tests: list this branch's unit-mcdc white-boxes in EXTRA_DIST

The tests/unit-mcdc/*.c MC/DC white-box supplements this branch adds each
#include a wolfCrypt .c and carry their own main(); they are built standalone
by the per-module coverage campaign and are NOT compiled into libwolfssl or
unit.test (that would duplicate main()/symbols). They are test-only.

The source-completeness check (per-PR diff) requires every file a PR adds to
appear in an include.am. Since these cannot be tests_unit_test_SOURCES, list
them in EXTRA_DIST -- the same bucket tests/api/include.am uses for its
non-compiled files -- so they ship in the dist tarball without being built.
Scope: only the white-boxes this branch introduces.

Author: danielinux

tests/include.am

@@ -101,3 +101,22 @@ EXTRA_DIST += tests/unit.h \
               tests/freertos-mem-track-repro/task.h \
               tests/freertos-mem-track-repro/run.sh
 DISTCLEANFILES+= tests/.libs/unit.test
+
+# MC/DC white-box supplements added by this branch (tests/unit-mcdc/): each
+# #includes a wolfCrypt .c and has its own main(), so they are built
+# standalone by the per-module coverage campaign, never compiled into
+# libwolfssl or unit.test. Test-only -> EXTRA_DIST (not tests_unit_test_SOURCES),
+# same bucket tests/api/include.am uses for its non-compiled files.
+EXTRA_DIST += \
+              tests/unit-mcdc/test_blake2b_whitebox.c \\
+              tests/unit-mcdc/test_blake2s_whitebox.c \\
+              tests/unit-mcdc/test_cryptocb_whitebox.c \\
+              tests/unit-mcdc/test_eccsi_whitebox.c \\
+              tests/unit-mcdc/test_hpke_whitebox.c \\
+              tests/unit-mcdc/test_logging_globalq_whitebox.c \\
+              tests/unit-mcdc/test_logging_whitebox.c \\
+              tests/unit-mcdc/test_memory_whitebox.c \\
+              tests/unit-mcdc/test_sakke_whitebox.c \\
+              tests/unit-mcdc/test_sp_c32_whitebox.c \\
+              tests/unit-mcdc/test_sp_c64_whitebox.c \\
+              tests/unit-mcdc/test_sp_x86_64_whitebox.c