Clean up no_libgcc

no_libgcc is no longer needed anywhere. Move all occurances to no_libcrt
and remove no_libgcc.

Test: build
Change-Id: I6dd49db71d05d7685aa90cc837627f65e6742d6d
diff --git a/sysprop/sysprop_test.go b/sysprop/sysprop_test.go
index d78238a..b470ba5 100644
--- a/sysprop/sysprop_test.go
+++ b/sysprop/sysprop_test.go
@@ -278,7 +278,7 @@
 
 		cc_library {
 			name: "liblog",
-			no_libgcc: true,
+			no_libcrt: true,
 			nocrt: true,
 			system_shared_libs: [],
 			recovery_available: true,