Remove residual blank line at start of Makefile

This is a residual of the $FreeBSD$ removal.

MFC After: 3 days (though I'll just run the command on the branches)
Sponsored by: Netflix

make_check: Deobit fmake support

We don't need make_check to work in a fmake world anymore (nor have we
in the past decade). Just remove it here.

Note in passing it's been 10 years since we've adde

make_check: Deobit fmake support

We don't need make_check to work in a fmake world anymore (nor have we
in the past decade). Just remove it here.

Note in passing it's been 10 years since we've added a new test here and
maybe we're past the need for this part of the build (or need to revamp
it to include all the features added to bmake since 2016 that the build
system silently depends on).

Sponsored by: Netflix
Reviewed by: brooks
Pull Request: https://github.com/freebsd/freebsd-src/pull/980

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Remove $FreeBSD$: one-line sh pattern

Remove /^\s*#[#!]?\s*\$FreeBSD\$.*$\n/

Merge from head@274682

IFC @r271694

Sync to HEAD@r270409.

Don't stop other legs of a parallel build due to a failure in make_check.
The whole point is to see if there's any failure, which is handled by
building a newer version of make.

Merge fresh head.

IFC @247348.

Sync with HEAD.

IFC @ r245178

Following r226271, allow disabling lzma support with "WITHOUT_LZMA_SUPPORT".
Correct r226271 which should have used WITHOUT_BZIP2_SUPPORT per r166255.

Obtained from: Juniper Networks

MFC

IFC @ r242684

Sync from head

Add support for bmake. This includes:
1. Don't do upgrade_checks when using bmake. As long as we have WITH_BMAKE,
there's a bootstrap complication in ths respect. Avoid it. Make the
necessar

Add support for bmake. This includes:
1. Don't do upgrade_checks when using bmake. As long as we have WITH_BMAKE,
there's a bootstrap complication in ths respect. Avoid it. Make the
necessary changes to have upgrade_checks work wth bmake anyway.
2. Remove the use of -E. It's not needed in our build because we use ?= for
the respective variables, which means that we'll take the environment
value (if any) anyway.
3. Properly declare phony targets as phony as bmake is a lot smarter (and
thus agressive) about build avoidance.
4. Make sure CLEANFILES is complete and use it on .NOPATH. bmake is a lot
smarter about build avoidance and should not find files we generate in
the source tree. We should not have files in the repository we want to
generate, but this is an easier way to cross this hurdle.
5. Have behavior under bmake the same as it is under make with respect to
halting when sub-commands fail. Add "set -e" to compound commands so
that bmake is informed when sub-commands fail.
6. Make sure crunchgen uses the same make as the rest of the build. This
is important when the make utility isn't called make (but bmake for
example).
7. While here, add support for using MAKEOBJDIR to set the object tree
location. It's the second alternative bmake looks for when determining
the actual object directory (= .OBJDIR).

Submitted by: Simon Gerraty <sjg@juniper.net>
Submitted by: John Van Horne <jvanhorne@juniper.net>

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Sync FreeBSD's bmake branch with Juniper's internal bmake branch.

Requested by: Simon Gerraty <sjg@juniper.net>

Merge head r236710 through r238467.

IFC @238412.

IFC @ r238370

MFC: r238143: move "funny targets" from pre-build "make check" to the
regular regression tests.

Remove the "funny targets" make check. We no longer need embedded :: targets
to build FreeBSD (they are used in Perl man pages). We never needed embedded
"!" in targets that I can find.

We got thi

Remove the "funny targets" make check. We no longer need embedded :: targets
to build FreeBSD (they are used in Perl man pages). We never needed embedded
"!" in targets that I can find.

We got this from OpenBSD and I cannot find any other make that supports
such things -- contrary to their commit message claim: "This behaviour
is also consistent with other versions of make.".

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IFC @ r222830

MFC

+ Tighten up (and simplify) the pass_cmd_vars_1 "variable definition arrived
from the calling make" test.
+ Be more tolerant of newlines in the plus_flag "supports the '+' flag" test.