Cleanup HOST_LONG_BITS, HOST_I386 and HOST_X86_64

HOST_LONG_BITS is now computed automatically in
include/qemu-common.h so remove all the configuration/probing
that was required before this patch to get the correct value.

Also get rid of HOST_I386 and HOST_X86_64 since they are not
needed anymore.

Change-Id: I61823a896033e38938346242b7aea78d3e832826
diff --git a/android/opengles.c b/android/opengles.c
index d4ff301..2570429 100644
--- a/android/opengles.c
+++ b/android/opengles.c
@@ -67,12 +67,12 @@
 #define DD(...) VERBOSE_PRINT(gles,__VA_ARGS__)
 
 /* Name of the GLES rendering library we're going to use */
-#if HOST_LONG_BITS == 32
+#if UINTPTR_MAX == UINT32_MAX
 #define RENDERER_LIB_NAME  "libOpenglRender"
-#elif HOST_LONG_BITS == 64
+#elif UINTPTR_MAX == UINT64_MAX
 #define RENDERER_LIB_NAME  "lib64OpenglRender"
 #else
-#error Unknown HOST_LONG_BITS
+#error Unknown UINTPTR_MAX
 #endif
 
 // Define the corresponding function pointers.