executor: include missing linux/falloc.h

Its needed for FALLOC_FL_ZERO_RANGE which needs this header, it works
with glibc because fcntl.h includes this header indirectly, however the
failure comes to fore with musl C library where this header is not
included indirectly by other system headers, therefore include it as
required.

Fixes
In file included from executor/common.h:505:
executor/common_linux.h:5604:16: error: use of undeclared identifier 'FALLOC_FL_ZERO_RANGE'
        fallocate(fd, FALLOC_FL_ZERO_RANGE, 0, SWAP_FILE_SIZE);
                      ^

0 files changed, 0 insertions, 0 deletions