Correct dependency on reduce.h not reduce.c

Signed-off-by: Rod Chapman <[email protected]>

Makefile

@@ -18,7 +18,7 @@ SOURCESKECCAK = $(SOURCES) fips202/keccakf1600.c fips202/fips202.c mlkem/symmetr
 SOURCESKECCAKRANDOM = $(SOURCESKECCAK) randombytes/randombytes.c
 SOURCESNISTKATS = $(SOURCESKECCAK) test/nistrng/aes.c test/nistrng/rng.c
 
-HEADERS = mlkem/params.h mlkem/kem.h mlkem/indcpa.h mlkem/polyvec.h mlkem/poly.h mlkem/ntt.h mlkem/cbd.h mlkem/reduce.c mlkem/verify.h mlkem/symmetric.h
+HEADERS = mlkem/params.h mlkem/kem.h mlkem/indcpa.h mlkem/polyvec.h mlkem/poly.h mlkem/ntt.h mlkem/cbd.h mlkem/reduce.h mlkem/verify.h mlkem/symmetric.h
 HEADERSKECCAK = $(HEADERS) fips202/keccakf1600.h fips202/fips202.h
 HEADERSKECCAKRANDOM = $(HEADERSKECCAK) randombytes/randombytes.h
 HEADERNISTKATS = $(HEADERSKECCAK) test/nistrng/aes.h test/nistrng/randombytes.h