test_build.sh: Build all programmers individually using Make

While testing CB:63724, which reworks the Meson build system, it showed
that some programmers have dependency issues, which were invisible since
test_build.sh builds flashrom with all programmers enabled and thus all
sources are included. Building flashrom with each programmer
individually made these issues visible.

However, as commit 877b7741fcf9 and commit b6a439e45ef2 show, the Make
build system also had some similar issues, which were invisible for the
same reason.

Thus, in addition to building all programmers at once using the Make
build system, build each programmer individually.

Also, when clang analyzer is used, it's not needed to run it on each
programmer individually. Just return after flashrom was built with all
programmers enabled in this case.

An equivalent patch for the Meson build system is made separately.

Signed-off-by: Felix Singer <felixsinger@posteo.net>
Change-Id: I3bacb3ba9c6708f1e7ef5a111290d0ea3af36f1d
Reviewed-on: https://review.coreboot.org/c/flashrom/+/66094
Reviewed-by: Anastasia Klimchuk <aklm@chromium.org>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Thomas Heijligen <src@posteo.de>
Reviewed-by: Nico Huber <nico.h@gmx.de>

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