Detect file import on pp disambiguation

It's a convention used by some Puppet modules to have nothing on "init.pp"
except imports of class and definition files. Though some Pascal versions
seems to use import as well, Puppet's import are followed by glob patterns
inside double quotes, while Pascal's import are followed by identifiers.

Use imports followed by double quotes to detect these files as Puppet
files.

src/detector.c

@@ -797,7 +797,7 @@ const char *disambiguate_pp(SourceFile *sourcefile) {
 
 	/* check for standard puppet constructs */
 	pcre *construct;
-	construct = pcre_compile("^\\s*(define\\s+[\\w:-]+\\s*\\(|class\\s+[\\w:-]+(\\s+inherits\\s+[\\w:-]+)?\\s*{|node\\s+\\'?[\\w:\\.-]+\\'?\\s*{)",
+	construct = pcre_compile("^\\s*(define\\s+[\\w:-]+\\s*\\(|class\\s+[\\w:-]+(\\s+inherits\\s+[\\w:-]+)?\\s*{|node\\s+\\'?[\\w:\\.-]+\\'?\\s*{|import\\s+\")",
 			PCRE_MULTILINE, &error, &erroffset, NULL);
 
 	if (pcre_exec(construct, NULL, p, mystrnlen(p, 10000), 0, 0, NULL, 0) > -1)