Fix a typo related to abidiffs

This commit fixes a typo related to abidiffs.  The generated abidiffs
should be copied to `$$DIST_DIR/abidiffs` instead of
`$$DIST_DIR/abidiff`.

(See also. https://android-review.googlesource.com/796458/)

Bug: 123491909
Test: lunch aosp_x86-userdebug && make dist
Change-Id: I89c13580344a27cac5ea0d00497f5bba3227cf61
diff --git a/cc/builder.go b/cc/builder.go
index 5dbd23e..b012d6f 100644
--- a/cc/builder.go
+++ b/cc/builder.go
@@ -199,7 +199,7 @@
 			// TODO(b/78139997): Add -check-all-apis back
 			commandStr := "($sAbiDiffer $allowFlags -lib $libName -arch $arch -o ${out} -new $in -old $referenceDump)"
 			commandStr += "|| (echo ' ---- Please update abi references by running $$ANDROID_BUILD_TOP/development/vndk/tools/header-checker/utils/create_reference_dumps.py -l ${libName} ----'"
-			commandStr += " && (mkdir -p $$DIST_DIR/abidiffs && cp ${out} $$DIST_DIR/abidiff/)"
+			commandStr += " && (mkdir -p $$DIST_DIR/abidiffs && cp ${out} $$DIST_DIR/abidiffs/)"
 			commandStr += " && exit 1)"
 			return blueprint.RuleParams{
 				Command:     commandStr,