9c5a426 Auto-sync with upstream branch master

Authored and Committed by Patsy Franklin 4 years ago
    Auto-sync with upstream branch master
    
    Upstream commit: 51ea67d54882318c4fa5394c386f4816ddc22408
    
    - powerpc: get_rounding_mode: utilize faster method to get rounding mode
    - riscv: Do not use __has_include__
    - powerpc: fegetexcept: utilize function instead of duplicating code
    - iconv: Use __twalk_r in __gconv_release_shlib
    - Fix iconv buffer handling with IGNORE error handler (swbz#18830)
    
        
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