Auto-sync with upstream branch master
    
    Upstream commit: cc47d5c5f53f6d845ac54698ae8929af15662c44
    
    - Linux: Use built-in system call tables
    - lv_LV locale: Correct the time part of d_t_fmt (swbz#25324)
    - km_KH locale: Use "%M" instead of "m" in d_t_fmt (swbz#25323)
    - ldbl-128ibm-compat: Do not mix -mabi=*longdouble and -mlong-double-128
    - ldbl-128ibm-compat: Compiler flags for stdio functions
    - Do not redirect calls to __GI_* symbols, when redirecting to *ieee128
    - aarch64: add default memcpy version for kunpeng920
    - aarch64: ifunc rename for kunpeng
    - aarch64: Modify error-shown comments for strcpy
    - linux: Consolidate sigprocmask
    - Fix return code for __libc_signal_* functions
    - nptl: Remove duplicate internal __SIZEOF_PTHREAD_MUTEX_T (swbz#25241)