Kill unused ARCH_* defines.

No one's using ARCH_AARCH64 or AARCH_MIPS64 yet, and ARCH_PPC was always more
aspirational than real.

Change-Id: I07c6cbad6eb0917c4c24848a98c3bc9a3fe72db6
diff --git a/core/combo/include/arch/darwin-x86/AndroidConfig.h b/core/combo/include/arch/darwin-x86/AndroidConfig.h
index b77d751..c83c54c 100644
--- a/core/combo/include/arch/darwin-x86/AndroidConfig.h
+++ b/core/combo/include/arch/darwin-x86/AndroidConfig.h
@@ -101,11 +101,7 @@
 /*
  * What CPU architecture does this platform use?
  */
-#if (defined(__ppc__) || defined(__ppc64__))
-#   define ARCH_PPC
-#elif (defined(__i386__) || defined(__x86_64__))
-#   define ARCH_X86
-#endif
+#define ARCH_X86
 
 /*
  * sprintf() format string for shared library naming.
diff --git a/core/combo/include/arch/linux-arm64/AndroidConfig.h b/core/combo/include/arch/linux-arm64/AndroidConfig.h
index c98ccdd..e4f98e0 100644
--- a/core/combo/include/arch/linux-arm64/AndroidConfig.h
+++ b/core/combo/include/arch/linux-arm64/AndroidConfig.h
@@ -96,11 +96,6 @@
 #define HAVE_LIBC_SYSTEM_PROPERTIES 1
 
 /*
- * What CPU architecture does this platform use?
- */
-#define ARCH_AARCH64
-
-/*
  * sprintf() format string for shared library naming.
  */
 #define OS_SHARED_LIB_FORMAT_STR    "lib%s.so"
diff --git a/core/combo/include/arch/linux-mips64/AndroidConfig.h b/core/combo/include/arch/linux-mips64/AndroidConfig.h
index 8467d04..3d258ea 100644
--- a/core/combo/include/arch/linux-mips64/AndroidConfig.h
+++ b/core/combo/include/arch/linux-mips64/AndroidConfig.h
@@ -112,11 +112,6 @@
 /* #define HAVE_SYSTEM_PROPERTY_SERVER */
 
 /*
- * What CPU architecture does this platform use?
- */
-#define ARCH_MIPS64 1
-
-/*
  * sprintf() format string for shared library naming.
  */
 #define OS_SHARED_LIB_FORMAT_STR    "lib%s.so"