Fix name of kernel required config option in INSTALL.md

In Linux Kernel 4.7, CONFIG_HAVE_BPF_JIT was splitted into two
(CONFIG_HAVE_EBPF_JIT and CONFIG_HAVE_CBPF_JIT) for distinguishing cBPF
and eBPF JITs
(https://www.mail-archive.com/netdev@vger.kernel.org/msg110538.html)

Fix typos

Add filter by cgroup-v2 id

INSTALL.md: add clang-devel as Fedora build dep

To get the cgroup id, you can use the following program to call
name_to_handle_at(), borrowed from
linux/tools/testing/selftests/bpf/cgroup_helpers.c:
```
wget https://gist.githubusercontent.com/alban/4a9aea9636d9fdf11709eddd21df4cc4/raw/f4fc915483a069d6044957e27df091923f95c48b/getcgroupid.c
gcc -Wall -o getcgroupid getcgroupid.c
./getcgroupid /sys/fs/cgroup/unified/
0x100000001
4294967297
```

To test it, I run the tracer in one terminal:
```
./build.sh
sudo ./build-release/src/bpftrace -e 'tracepoint:syscalls:sys_enter_openat /cgroup == 0x100000001/ { printf("%s\n", str(args->filename)); }'
```

And some tests in another terminal:
```
sudo -s
echo $$ > /sys/fs/cgroup/unified/cgroup.procs
cat /dev/null
```

And observe the output of the tracer:
```
Attaching 1 probe...
/etc/ld.so.cache
/lib64/libc.so.6
/usr/lib/locale/locale-archive
/dev/null
^C
```

List clang-devel as a build dependency on Fedora.
Otherwise 'cmake' fails with:

```
CMake Error at CMakeLists.txt:67 (find_package):
  By not providing "FindClang.cmake" in CMAKE_MODULE_PATH this project has
  asked CMake to find a package configuration file provided by "Clang", but
  CMake did not find one.

  Could not find a package configuration file provided by "Clang" with any of
  the following names:

    ClangConfig.cmake
    clang-config.cmake

  Add the installation prefix of "Clang" to CMAKE_PREFIX_PATH or set
  "Clang_DIR" to a directory containing one of the above files.  If "Clang"
  provides a separate development package or SDK, be sure it has been
  installed.
```

Remove llvm, llvm-libs since llvm-devel already pulls them in.

fixed some small errors

add fedora installation instructions to readme

update tutorial with kprobe struct args

fixes: https://github.com/iovisor/bpftrace/issues/8

Update README/INSTALL

filename typo

Tools

To get full arguments to pass into Clang for reading kernel headers

cmake: rename gtest external project target

This avoids a conflict in some environments (Arch Linux)

Fixes: #135
Signed-off-by: Brenden Blanco <bblanco@gmail.com>

update more tools to use args

Tracepoint adjust integer types

promote scalar printf args to 64-bits

freeze googletest version