Clean `.buildinfo` only if `.buildinfo.in` exists

Signed-off-by: Herbert Valerio Riedel <hvr@gnu.org>

ghc.mk

@@ -1220,7 +1220,7 @@ clean_libraries: $(patsubst %,clean_libraries/%_dist-boot,$(PACKAGES_STAGE0))
 
 clean_libraries:
 	$(call removeTrees,$(patsubst %, libraries/%/dist, $(PACKAGES_STAGE1) $(PACKAGES_STAGE2)))
-	$(call removeFiles,$(wildcard $(patsubst %, libraries/%/*.buildinfo, $(PACKAGES_STAGE1) $(PACKAGES_STAGE2))))
+	$(call removeFiles,$(wildcard $(patsubst %.in, %, $(wildcard $(patsubst %, libraries/%/*.buildinfo.in, $(PACKAGES_STAGE1) $(PACKAGES_STAGE2))))))
 	$(call removeFiles,$(patsubst %, libraries/%/config.log, $(PACKAGES_STAGE1) $(PACKAGES_STAGE2)))
 	$(call removeFiles,$(patsubst %, libraries/%/config.status, $(PACKAGES_STAGE1) $(PACKAGES_STAGE2)))
 	$(call removeFiles,$(wildcard $(patsubst %, libraries/%/include/Hs*Config.h, $(PACKAGES_STAGE1) $(PACKAGES_STAGE2))))