regress: Add Fundamental type with no set/get-value-func's

A fundamental type may or may not provide set and get value functions,
the regress implementations always provide one, so define a new type
with no such functions so that we can test this case in Gjs.

To avoid repeating lots of duplicated code, we re-use the same
functions of RegressTestFundamentalObject when possible, by using the
same structure.
7 jobs for fundamental-without-set-get-funcs in 4 minutes and 12 seconds (queued for 1 second)
Status Job ID Name Coverage
  Build
passed #1243611
example-autotools

00:02:17

passed #1243610
example-meson

00:01:50

passed #1243612
fedora-x86_64-meson

00:02:08

passed #1243614
fedora-x86_64-python3.6

00:01:43

passed #1243613
fedora-x86_64-subprojects

00:02:50

passed #1243615
win32-ps
msys2-mingw32-meson

00:03:13

passed #1243616
win32-ps
vs2017-x64-meson

00:04:10