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cpm: Various minor fixes

See merge request !8

Previously when an invalid path option was given, the project name was
discarded, resulting in an error parsing the project file instead of an
error in the path command

Fix double flags mbac

See merge request !7

This reverts commit fb6b8d97.

Enables only using GCC on linux

See merge request !6

This reverts commit 0d2858d4.

In some cases you do not want to use the built-in optimizing linker. You
can only use GCC by (for example):

    EnvironmentLinker:	/usr/bin/gcc::-g -lmysqlclient|... (other
    linkers)

Note that :: ensures the options are passed to gcc.
Co-authored-by: Mart Lubbers <mart@martlubbers.net>

Support options2 for linker as well

See merge request !5

cpm: Support adding multiple paths

See merge request !4

The following entry in IDEEnvs:
EnvironmentLinker:	lib/exe/linker:-h 200m:-lmysql

Will call the linker with a heap of 200M and pass -lmysql to gcc/ld

In some extravagant cases (large projects with descriptors etc.), the
linker needs more heap as well

Update project files for linux and add CI

See merge request !3

Add newlines to errors

See merge request !2

Add profiling and rts options to cpm

See merge request !1

There are some illegal combinations possible if you manually edit
project files. This patch bails out instead of allowing the compiler to
generate code that crashes.