CBS Makefile builder does not parse build / clean commands fully

[jonahgraham]

Entering anything other than a simple string in CBS Makefile builder's build / clean commands don't parse correctly and are not passed to make as expected.

I am referring to these fields:

For example, enter make all with an extra space leads to a make error:

This is happening because the builder is simply splitting on " " which leads to an extra empty command line option

cdt/core/org.eclipse.cdt.core/src/org/eclipse/cdt/core/build/StandardBuildConfiguration.java

Line 102 in 84d99f2

buildCommand = buildCmd.split(" "); //$NON-NLS-1$

This also means other, more complicated cases, such as quoted strings are not handled properly either:

leads to:

[jonahgraham]

Another common-ish use case that needs proper parsing is passing things like CFLAGS on the build command line, e.g. make CFLAGS="-Wall -g" does not work today and it should be made to work, today the space in the middle is split so you get output like this:

[ewaterlander]

Thanks for this fix!
LGTM.