Build-time PREFIX is assumed to have fixed value in shine and shinec

[leonidborisenko]

Even if PREFIX had been set to custom value (not default /usr/local) before building Shine, shine and shinec still look into /usr/local for standard library. Here is relevant code excerpt from src/shine.lua:

package.path  = './lib/?.raw;./lib/?.lua;'..package.path
package.path  = './?.shn;./lib/?.shn;/usr/local/share/shine/?.shn;'..package.path
package.path  = './?/init.shn;./lib/?/init.shn;/usr/local/share/shine/?/init.shn;'..package.path..';'
package.cpath = './lib/?.so;'..package.cpath
package.cpath = '/usr/local/lib/shine/?.so;'..package.cpath..';'