delete mode 100644 lib/libc/mingw/math/x86/cos.def.h
 delete mode 100644 lib/libc/mingw/math/x86/cosl.c
 delete mode 100644 lib/libc/mingw/math/x86/cosl_internal.S
 delete mode 100644 lib/libc/musl/src/math/__cosl.c
 delete mode 100644 lib/libc/musl/src/math/cosl.c