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/apex/apex_test.go b/apex/apex_test.go
index 5276ce4..f71abd7 100644
--- a/apex/apex_test.go
+++ b/apex/apex_test.go
@@ -585,7 +585,7 @@
 
 		cc_library {
 			name: "libc",
-			no_libgcc: true,
+			no_libcrt: true,
 			nocrt: true,
 			system_shared_libs: [],
 			stl: "none",
@@ -596,7 +596,7 @@
 
 		cc_library {
 			name: "libm",
-			no_libgcc: true,
+			no_libcrt: true,
 			nocrt: true,
 			system_shared_libs: [],
 			stl: "none",
@@ -607,7 +607,7 @@
 
 		cc_library {
 			name: "libdl",
-			no_libgcc: true,
+			no_libcrt: true,
 			nocrt: true,
 			system_shared_libs: [],
 			stl: "none",