update elements and fix some bugs

lib/src/prism/components/prism-makefile.js

 Prism.languages.makefile = {
         'comment': {
-                pattern: /(^|[^\\])#(?:\\[\s\S]|.)*/,
+                pattern: /(^|[^\\])#(?:\\(?:\r\n|[\s\S])|.)*/,
                 lookbehind: true
         },
-        'string': /(["'])(?:\\[\s\S]|(?!\1)[^\\\r\n])*\1/,
+        'string': /(["'])(?:\\(?:\r\n|[\s\S])|(?!\1)[^\\\r\n])*\1/,
 
         // Built-in target names
         'builtin': /\.[A-Z][^:#=\s]+(?=\s*:(?!=))/,
 
         // Targets
         'symbol': {
                 pattern: /^[^:=\r\n]+(?=\s*:(?!=))/m,
                 inside: {
                         'variable': /\$+(?:[^(){}:#=\s]+|(?=[({]))/
                 }
         },
         'variable': /\$+(?:[^(){}:#=\s]+|\([@*%<^+?][DF]\)|(?=[({]))/,
 
         'keyword': [
                 // Directives
-                /\b(?:define|else|endef|endif|export|ifn?def|ifn?eq|-?include|override|private|sinclude|undefine|unexport|vpath)\b/,
+                /-include\b|\b(?:define|else|endef|endif|export|ifn?def|ifn?eq|include|override|private|sinclude|undefine|unexport|vpath)\b/,
                 // Functions
                 {
                         pattern: /(\()(?:addsuffix|abspath|and|basename|call|dir|error|eval|file|filter(?:-out)?|findstring|firstword|flavor|foreach|guile|if|info|join|lastword|load|notdir|or|origin|patsubst|realpath|shell|sort|strip|subst|suffix|value|warning|wildcard|word(?:s|list)?)(?=[ \t])/,
                         lookbehind: true
                 }
         ],
         'operator': /(?:::|[?:+!])?=|[|@]/,
         'punctuation': /[:;(){}]/
 };