Fixes for compiling some A13 roms
kbuild: use HOSTLDFLAGS for single .c executables: https://github.com/Nem1xx/A13-COMPILE-FIX-LD-CLANG/commit/a717077ce4ae84133052c6dbadbc59324646a24c
Path: /kernel/xiaomi/sdm439/scripts/Makefile.host
Disable LLVM_BINUTILS: https://github.com/Nem1xx/A13-COMPILE-FIX-LD-CLANG/commit/d4cd31e78d42d9cc5490f36a4d3fea98b663dd56
Path: /device/xiaomi/Mi439/BoardConfig.mk