Add libraw: library for processing raw image files

[mardy]

Let's keep jasper disabled for now, as it produces build errors:

/mnt/Lavoro/mxe/mxe/usr/x86_64-w64-mingw32.shared/include/jasper/jas_math.h:
In function 'bool jas_safe_intfast32_mul(int_fast32_t, int_fast32_t,
                                         int_fast32_t*)':
/mnt/Lavoro/mxe/mxe/usr/x86_64-w64-mingw32.shared/include/jasper/jas_math.h:241:12:
error: 'INT_FAST32_MAX' was not declared in this scope
    if (x > INT_FAST32_MAX / y) {
                    ^

It's not a required dependency, but we might want to add it later if
someone asks for it (and can provide a solution).

[mardy]

I added a test, and verified that the produced binary works in a Windows machine.

[mardy]

Hi! Is there anything else I could do to help get this merged?

[tonytheodore]

Thanks!

The beta version is also successful with:

make update-package-libraw GITHUB_TAG_FILTER=any-no-match-string

but bypassing the default should be clearer