debuggerd: switch to using platform headers for DEBUGGER_SIGNAL.

Test: treehugger
Change-Id: Ie9736c4a077dba1029d2352bd94d47ce07323aec
diff --git a/debuggerd/crasher/Android.bp b/debuggerd/crasher/Android.bp
index 7bec470..e86f499 100644
--- a/debuggerd/crasher/Android.bp
+++ b/debuggerd/crasher/Android.bp
@@ -44,6 +44,7 @@
     name: "crasher",
 
     defaults: ["crasher-defaults"],
+    header_libs: ["bionic_libc_platform_headers"],
     shared_libs: [
         "libbase",
         "liblog",
@@ -65,6 +66,7 @@
     defaults: ["crasher-defaults"],
     cppflags: ["-DSTATIC_CRASHER"],
     static_executable: true,
+    header_libs: ["bionic_libc_platform_headers"],
     static_libs: [
         "libdebuggerd_handler",
         "libbase",