Add rsync, m4 to the generated images

it's hard to use opam without installing them :)
16 jobs for master in 111 minutes and 58 seconds (queued for 4 seconds)
Child pipeline (parent)
Status Job ID Name Coverage
  Build
passed #74162
ocaml-image-4.02.3

00:42:46

passed #74163
ocaml-image-4.03.0

00:49:08

failed #74164
ocaml-image-4.04.2

00:15:52

failed #74165
ocaml-image-4.05.0

00:18:04

passed #74166
ocaml-image-4.06.1

00:53:51

passed #74167
ocaml-image-4.07.1

00:45:48

failed #74188
ocaml-image-4.08.1

00:16:23

failed #74187
ocaml-image-4.09.1

00:16:08

passed #74183
ocaml-image-4.10.1

00:05:00

passed #74174
ocaml-image-4.11.1

00:36:24

failed #74168
ocaml-image-4.08.1

00:18:39

failed #74169
ocaml-image-4.09.1

00:24:08

passed #74179
ocaml-image-4.10.1

00:05:05

passed #74173
ocaml-image-4.10.1

00:04:54

passed #74170
ocaml-image-4.10.1

00:51:27

failed #74171
ocaml-image-4.11.1

00:16:20

 
Name Stage Failure
failed
ocaml-image-4.08.1 Build
make[2]: Leaving directory '/src/ocaml/tools'
if test -f ocamlopt.opt -a -f flexdll/flexlink.opt ; then \
/usr/bin/install -c -m u=rwx,g=rwx,o=rx \
flexdll/flexlink.opt "/usr/local/bin/flexlink" ; \
fi
make[1]: Leaving directory '/src/ocaml'
INFO[0933] Taking snapshot of full filesystem...
Cleaning up file based variables
ERROR: Job failed: command terminated with exit code 137
failed
ocaml-image-4.09.1 Build
make[2]: Leaving directory '/src/ocaml/tools'
if test -f ocamlopt.opt -a -f flexdll/flexlink.opt ; then \
/usr/bin/install -c -m u=rwx,g=rwx,o=rx \
flexdll/flexlink.opt "/usr/local/bin/flexlink" ; \
fi
make[1]: Leaving directory '/src/ocaml'
INFO[0930] Taking snapshot of full filesystem...
Cleaning up file based variables
ERROR: Job failed: command terminated with exit code 137
failed
ocaml-image-4.05.0 Build
checking for getrusage... yes
checking for times... yes
checking for secure_getenv... yes
checking for issetugid... yes
checking for library containing clock_gettime... none required
checking for socket... yes
checking for socketpair... yes
checking for bind...
Cleaning up file based variables
ERROR: Job failed: command terminated with exit code 137
failed
ocaml-image-4.04.2 Build
../boot/ocamlrun ../ocamlopt -nostdlib -I ../stdlib -shared -o generators/odoc_todo.cmxs -pp './remove_DEBUG' -I ../parsing -I ../utils -I ../typing -I ../driver -I ../bytecomp -I ../toplevel/ -I ../stdlib -I ../otherlibs/str -I ../otherlibs/dynlink -I ../otherlibs/unix -I ../otherlibs/num -I ../otherlibs/graph -absname -w +a-4-9-41-42-44-45-48 -warn-error A -safe-string -strict-sequence -strict-formats generators/odoc_todo.ml
../boot/ocamlrun ../ocamlopt -nostdlib -I ../stdlib -shared -o generators/odoc_literate.cmxs -pp './remove_DEBUG' -I ../parsing -I ../utils -I ../typing -I ../driver -I ../bytecomp -I ../toplevel/ -I ../stdlib -I ../otherlibs/str -I ../otherlibs/dynlink -I ../otherlibs/unix -I ../otherlibs/num -I ../otherlibs/graph -absname -w +a-4-9-41-42-44-45-48 -warn-error A -safe-string -strict-sequence -strict-formats generators/odoc_literate.ml
make[4]: Leaving directory '/src/ocaml/ocamldoc'
make[3]: Leaving directory '/src/ocaml/ocamldoc'
make[2]: Leaving directory '/src/ocaml'
make[1]: Leaving directory '/src/ocaml'
INFO[0898] Taking snapshot of full filesystem...
Cleaning up file based variables
ERROR: Job failed: command terminated with exit code 137