[libc] Remove assert to fix rv32 buildbot

Author: mikhailramalho

libc/src/unistd/linux/dup2.cpp

@@ -32,7 +32,6 @@ LLVM_LIBC_FUNCTION(int, dup2, (int oldfd, int newfd)) {
     int ret = LIBC_NAMESPACE::syscall_impl<int>(SYS_fcntl, oldfd, F_GETFD);
 #elif defined(SYS_fcntl64)
     // Same as fcntl but can handle large offsets
-    static_assert(sizeof(off_t) == 8);
     int ret = LIBC_NAMESPACE::syscall_impl<int>(SYS_fcntl64, oldfd, F_GETFD);
 #else
 #error "SYS_fcntl and SYS_fcntl64 syscalls not available."