Define graphene_lerp as graphene_flerf
The vast majority of lerp uses are for single precision floating point
values; when not building Graphene with a C11 compiler, we should use
flerpf as the implementation of the lerp operator.
@@ -144,7 +144,7 @@ graphene_ilerp (int a, int b, double factor)
default: graphene_flerp) ((a), (b), (f))
#else
-# define graphene_lerp graphene_flerp
+# define graphene_lerp graphene_flerpf
#endif
static inline void
