Fix building with clang · Pull Request !239 · openEuler/gcc

It contains 3 commits

```
Set fallback value for -print-multi-os-directory
    Clang doesn't support -print-multi-os-directory option.
    So let's set the fallback value (../lib64) if it is empty.
    
    This is only needed for the projects built by hostcc:
      gcc, libcc1, libiberty
    
    The projects for targets only, will always built by gcc itself.
```

```
Fix enum { INPUT, MIDDLE, FINAL } aes_stage
    The FINAL is defined in ansidecl.h.
    Let's rename the elements to
       aesINPUT, aseMIDDLE, aseFINAL
    to avoid conflits.
    
    I find this problem when trying to build gcc with clang.
    In fact FINAL is defined to empty for clang, and `final` for gcc.
    So it coincidentally worked for gcc.
```

```
gcc/opts-common.cc: Fix build with clang
    1. For putenv ("AI_INFER_LEVEL=1"), clang complains that C++11 deprecates
    convert string literal to char *, while putenv expcets "char *".
    Let's use setenv, which expects "const char *".
    
    2. Ditto for char *lan in handle_lto_option.
    
    3. In `handle_machine_option`, there is a variable length array,
         int64_t argv_hw[argc_hw]
       clang complains about it, and in fact, argc_hw can be an const var.
```

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