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raster: lines: the range is [0,1) not [0,1]

--- a/rast.c

+++ b/rast.c

@@ -228,8 +228,8 @@

 		if(α₂ < 0) return 0;

 		α₁ = 0;

 		β₁ = (y₂-y₁)/(x₂-x₁)*(0-x₁)+y₁;

-	}else if(α₁ > 1){

-		if(α₂ > 1) return 0;

+	}else if(α₁ >= 1){

+		if(α₂ >= 1) return 0;

 		α₁ = 1;

 		β₁ = (y₂-y₁)/(x₂-x₁)*(1-x₁)+y₁;

 	}

@@ -236,7 +236,7 @@

 	if(α₂ < 0){

 		α₂ = 0;

 		β₂ = (y₂-y₁)/(x₂-x₁)*(0-x₁)+y₁;

-	}else if(α₂ > 1){

+	}else if(α₂ >= 1){

 		α₂ = 1;

 		β₂ = (y₂-y₁)/(x₂-x₁)*(1-x₁)+y₁;

 	}

@@ -244,8 +244,8 @@

 		if(β₂ < 0) return 0;

 		β₁ = 0;

 		α₁ = (x₂-x₁)/(y₂-y₁)*(0-y₁)+x₁;

-	}else if(β₁ > 1){

-		if(β₂ > 1) return 0;

+	}else if(β₁ >= 1){

+		if(β₂ >= 1) return 0;

 		β₁ = 1;

 		α₁ = (x₂-x₁)/(y₂-y₁)*(1-y₁)+x₁;

 	}

@@ -252,7 +252,7 @@

 	if(β₂ < 0){

 		β₂ = 0;

 		α₂ = (x₂-x₁)/(y₂-y₁)*(0-y₁)+x₁;

-	}else if(β₂ > 1){

+	}else if(β₂ >= 1){

 		β₂ = 1;

 		α₂ = (x₂-x₁)/(y₂-y₁)*(1-y₁)+x₁;

 	}