cogl-material: Set blend constant even if alpha and rgb factors are the same
cogl-material: Set blend constant even if alpha and rgb factors are the same

Previously it would only set the blend constant if glBlendFuncSeparate
was used but it is perfectly acceptable to use the blend constant when
the same factor is used for each. It now sets the blend constant
whenever one of the factors would use the constant.

djdeath/cogl-android,gcampax/cogl,djdeath/cogl,Distrotech/cogl,Distrotech/cogl,gcampax/cogl,Distrotech/cogl,djdeath/cogl,collects/cogl,collects/cogl,djdeath/cogl-android,Distrotech/cogl,spatulasnout/cogl,gcampax/cogl,djdeath/cogl,spatulasnout/cogl,gcampax/cogl,djdeath/cogl-android