libbinder: remove 32-bit ABI support

This was an old userspace ABI, but we've encouraged all
platforms to move to a consistent ABI, regardless of
bitness of the device. This corresponds to a kernel
config option that we started requiring not be set
in Android P.

After this, the build system still needs to have this support
removed.

Bug: 232423610
Test: boot cf
Change-Id: Iff5997f910d86c73bbd6502ec393434d248cdcd5
diff --git a/libs/binder/tests/binderLibTest.cpp b/libs/binder/tests/binderLibTest.cpp
index 8974ad7..abc423b 100644
--- a/libs/binder/tests/binderLibTest.cpp
+++ b/libs/binder/tests/binderLibTest.cpp
@@ -48,7 +48,6 @@
 #include <sys/un.h>
 
 #include "../binder_module.h"
-#include "binderAbiHelper.h"
 
 #define ARRAY_SIZE(array) (sizeof array / sizeof array[0])
 
@@ -2022,9 +2021,7 @@
     return 1; /* joinThreadPool should not return */
 }
 
-int main(int argc, char **argv) {
-    ExitIfWrongAbi();
-
+int main(int argc, char** argv) {
     if (argc == 4 && !strcmp(argv[1], "--servername")) {
         binderservername = argv[2];
     } else {