Add ability to force compile as 64 bit.

When trying to build a single 64 bit and 32 bit image, there are
a few executables that are prefer32. When set, this will force all
of those targets to be compiled as 64 bit.

Test: With this option, drmserver/mediaserver are built as 64 bit.
Test: Without this option, drmserver/mediaserver are built as 32 bit.
Change-Id: I1c3dbe229f9b612ff76b857ca7163b14e7dc92c5
diff --git a/android/config.go b/android/config.go
index 47346fc..a5337d0 100644
--- a/android/config.go
+++ b/android/config.go
@@ -1725,6 +1725,10 @@
 	return c.config.productVariables.GenerateAidlNdkPlatformBackend
 }
 
+func (c *config) IgnorePrefer32OnDevice() bool {
+	return c.productVariables.IgnorePrefer32OnDevice
+}
+
 // The ConfiguredJarList struct provides methods for handling a list of (apex, jar) pairs.
 // Such lists are used in the build system for things like bootclasspath jars or system server jars.
 // The apex part is either an apex name, or a special names "platform" or "system_ext". Jar is a