Add cc_prebuilt_library helpers for use by the llvm_prebuilt_library_static converter.

Test: bazel build //prebuilts/clang/host/linux-x86:prebuilt_libFuzzer
Test: bazel build //prebuilts/clang/host/linux-x86:prebuilt_libomp
Test: bazel build //prebuilts/clang/host/linux-x86:prebuilt_libunwind
Test: bazel build //prebuilts/clang/host/linux-x86:prebuilt_libunwind-exported

Change-Id: I9343e19a149b62785e8ee3096254776c19675032
diff --git a/bp2build/cc_library_conversion_test.go b/bp2build/cc_library_conversion_test.go
index 49f1f42..b87d713 100644
--- a/bp2build/cc_library_conversion_test.go
+++ b/bp2build/cc_library_conversion_test.go
@@ -497,7 +497,7 @@
         "//build/bazel/platforms/os:android": ["-DANDROID_SHARED"],
         "//conditions:default": [],
     }) + select({
-        "//build/bazel/platforms:android_arm": ["-DANDROID_ARM_SHARED"],
+        "//build/bazel/platforms/os_arch:android_arm": ["-DANDROID_ARM_SHARED"],
         "//conditions:default": [],
     }),
     shared_srcs = ["sharedonly.cpp"] + select({
@@ -844,8 +844,8 @@
     ],
     srcs = ["a.cpp"],
     version_script = select({
-        "//build/bazel/platforms:android_arm": "android_arm.map",
-        "//build/bazel/platforms:linux_bionic_arm64": "linux_bionic_arm64.map",
+        "//build/bazel/platforms/os_arch:android_arm": "android_arm.map",
+        "//build/bazel/platforms/os_arch:linux_bionic_arm64": "linux_bionic_arm64.map",
         "//conditions:default": None,
     }),
 )`},