Move API levels from `uint32_t` to `int`.

(cherrypick of a6c71a09670ca636cca5cfea9d74b03a951e2b5e.)

Bug: N/A
Test: builds
Change-Id: I9c414e30e3c4fe2a4e16a2fe4ce18eae85fe4844
diff --git a/libc/private/bionic_sdk_version.h b/libc/private/bionic_sdk_version.h
index 871d25c..b352d9a 100644
--- a/libc/private/bionic_sdk_version.h
+++ b/libc/private/bionic_sdk_version.h
@@ -19,6 +19,6 @@
 
 #include <stdint.h>
 
-uint32_t bionic_get_application_target_sdk_version();
+int bionic_get_application_target_sdk_version();
 
 #endif  // _BIONIC_SDK_VERSION_H_