delete mode 100644 lib/libc/mingw/math/copysign.c
 delete mode 100644 lib/libc/mingw/math/copysignf.c
 delete mode 100644 lib/libc/mingw/math/x86/copysignl.S
 delete mode 100644 lib/libc/musl/src/math/copysign.c
 delete mode 100644 lib/libc/musl/src/math/copysignf.c
 delete mode 100644 lib/libc/musl/src/math/copysignl.c
 delete mode 100644 lib/libc/musl/src/math/riscv32/copysign.c
 delete mode 100644 lib/libc/musl/src/math/riscv32/copysignf.c
 delete mode 100644 lib/libc/musl/src/math/riscv64/copysign.c
 delete mode 100644 lib/libc/musl/src/math/riscv64/copysignf.c