Adding QMake (Make-like) language.

Mostly because the file extension conflicts with that of Prolog.

samples/QMake/functions.pri

@@ -0,0 +1,8 @@
+# QMake include file that calls some functions
+# and does nothing else...
+
+exists(.git/HEAD) {
+    system(git rev-parse HEAD >rev.txt)
+} else {
+    system(echo ThisIsNotAGitRepo >rev.txt)
+}