This makes the source section of recipe.toml optional, so that one can
simply create a recipe with a build recipe and a source folder and not
have to worry about git at all just to get a program running in redox.

I also ran into a situation where a source directory without a git
repository in it caused cookbook to reset it's own origin URL to the URL
specified in the recipe for that source directory. I added a check to
prevent that happening to anybody else.

Fix broken xz recipe

See merge request !247

Caused by !246

Remove customization of and update xz.

See merge request !246

I updated the recipe to use newest the raw xz upstream source and
cleaned out my recipes and rebuilt. I have detected no problems.
Not having to have customizations will make it easier to upgrade
int the future as new versions are released.

Signed-off-by: Wren Turkal <wt@penguintechs.org>

Compile gnu-binutils with pie so it works on Redox

See merge request !245

Because our dynamic linker still doesn't support global offset tables
and those difficult stuffs

Fix pciids recipe.

See merge request !244

The wrong variable was being used in the build script.

Signed-off-by: Wren Turkal <wt@penguintechs.org>

Add recipe for the pci.ids db.

See merge request !242

Make clean work when a recipe has no recipe.sh.

See merge request !243