more fixes towards working convex-convex, in case of (too) many edge-edge cases:

1) sample directions over a unit sphere and
2) add a contact, using mpr
add missing bullet.pc.cmake file (for old Bullet 2.x)

src/Bullet3Collision/NarrowPhaseCollision/shared/b3MprPenetration.h

@@ -860,8 +860,8 @@ inline int b3MprPenetration(int pairIndex, int bodyIndexA, int bodyIndexB,
 	 b3MprSimplex_t portal;
 
 	 
-	if (!hasSepAxis[pairIndex])
-		return -1;
+//	if (!hasSepAxis[pairIndex])
+	//	return -1;
 	
 	hasSepAxis[pairIndex] = 0;
 	 int res;