Define paths for new "-exactApi" output files.

This new feature creates files with exactly the annotated APIs
instead of a giant superset.  (This makes it easier to compare diffs
between releases.)

Test: make update-api && make -j32 online-system-api-sdk-docs
Bug: 38146029
Change-Id: Ia7ddac43a0ead380025e248ee22072e11c50e263
diff --git a/core/config.mk b/core/config.mk
index 559b987..cd20354 100644
--- a/core/config.mk
+++ b/core/config.mk
@@ -778,8 +778,10 @@
 INTERNAL_PLATFORM_REMOVED_API_FILE := $(TARGET_OUT_COMMON_INTERMEDIATES)/PACKAGING/removed.txt
 INTERNAL_PLATFORM_SYSTEM_API_FILE := $(TARGET_OUT_COMMON_INTERMEDIATES)/PACKAGING/system-api.txt
 INTERNAL_PLATFORM_SYSTEM_REMOVED_API_FILE := $(TARGET_OUT_COMMON_INTERMEDIATES)/PACKAGING/system-removed.txt
+INTERNAL_PLATFORM_SYSTEM_EXACT_API_FILE := $(TARGET_OUT_COMMON_INTERMEDIATES)/PACKAGING/system-exact.txt
 INTERNAL_PLATFORM_TEST_API_FILE := $(TARGET_OUT_COMMON_INTERMEDIATES)/PACKAGING/test-api.txt
 INTERNAL_PLATFORM_TEST_REMOVED_API_FILE := $(TARGET_OUT_COMMON_INTERMEDIATES)/PACKAGING/test-removed.txt
+INTERNAL_PLATFORM_TEST_EXACT_API_FILE := $(TARGET_OUT_COMMON_INTERMEDIATES)/PACKAGING/test-exact.txt
 
 # This is the standard way to name a directory containing prebuilt target
 # objects. E.g., prebuilt/$(TARGET_PREBUILT_TAG)/libc.so