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This allows building for arm and intel without having to apply a patch

add linker calling convention (:convention: before linker file name) for windows, use specified file name instead of /usr/bin/gcc for gcc calling convention on Unix

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>

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

in CompileStartCommand don't pass options1 twice, when starting the compiler and when compiling a module

rename result to exit_code and test if exit_code==0 instead of >=0 to determine if the linker succeeds
(clm uses r>=0 && status==0, but r is not result (now exit_code) in this function)

separated by a : (: is also used to separate the compiler executable file name and the arguments)