Remove duplicate flag in book chapter about C compilation
@@ -16,7 +16,7 @@ The first two steps were [described previously](tlibc.md); the latter two are de
To build and link a dummy C program to tlibc, the invocation of `gcc` currently requires several arguments to customize the compiler's behavior as well as its usage of the `ld` linker. The key arguments are shown and described below:
```sh
-x86_64-elf-gcc -o dummy_works \
+x86_64-elf-gcc \
-mno-red-zone -nostdlib -nostartfiles \
-ffunction-sections -fdata-sections \
-mcmodel=large \
