Add a list of files to uncrustify

We only want to affect the coding style of a subset of the source files
in Graphene, so let's specify them.

Author: ebassi

build-aux/uncrustify-list.txt

@@ -0,0 +1,18 @@
+# Ignore the SIMD sources, as they have a weird indentation
+src/graphene-alloc.c
+src/graphene-box.c
+src/graphene-euler.c
+src/graphene-frustum.c
+src/graphene-gobject.c
+src/graphene-matrix.c
+src/graphene-plane.c
+src/graphene-point3d.c
+src/graphene-point.c
+src/graphene-quad.c
+src/graphene-quaternion.c
+src/graphene-ray.c
+src/graphene-rect.c
+src/graphene-size.c
+src/graphene-sphere.c
+src/graphene-triangle.c
+src/graphene-vectors.c