Remove llvm/api file matching. DO NOT MERGE

We are moving to a single llvm executable able to handle all
API levels so this file (helping select the llvm exe depending
on target API is not needed anymore).

Cherry-pick from master 73aa4b5

Change-Id: Icc9b035740679eacfa59d452f71e71355816f7be

build/sdk.atree

@@ -42,7 +42,6 @@ bin/adb                                       platform-tools/adb
 bin/aapt                                      platform-tools/aapt
 bin/aidl                                      platform-tools/aidl
 bin/llvm-rs-cc                                platform-tools/llvm-rs-cc
-development/sdk/llvm-rs-cc.txt                platform-tools/llvm-rs-cc.txt
 
 # dx
 bin/dx                                        platform-tools/dx

sdk/llvm-rs-cc.txt

@@ -1,5 +0,0 @@
-# map versions of the llvm-rs-cc compiler with the min API level.
-# <compiler version>:<api leve>
-# the compiler version number maps to the filename llvm-rs-cc-<version>[.exe]
-# except for version 1 which is simply llvm-rs-cc[.exe]
-1:11