chore: build system adjustments

Remove build.h and version.tex from versioning, they're autogenerated
Make 'Makefile' the dummy makefile to instruct user to launch configure if no GNUmakefile is found
Make GNUmakefile the generated makefile and exclude it from the versioning
Update .gitignore accordingly

.gitignore

@@ -1,3 +1,18 @@
 .pc
 *.o
 *~
+*.gcno
+*.gcda
+*.gcov
+Makefile.config
+configure.log
+locale/Makefile
+GNUmakefile
+.gitignore
+simple-md5sum
+inlined-icons.h
+help-dialogs.h
+dvdisaster
+build.h
+dvdisaster.mo
+locale/messages.pot

GNUmakefile

@@ -1,4 +0,0 @@
-all:
-	@echo
-	@echo "Please create a Makefile by entering \"bash configure\" first"
-	@echo

GNUmakefile.template

@@ -286,10 +286,6 @@ distclean: clean
 	@echo "Removing configuration files"
 	@rm -f configure.log Makefile.config GNUmakefile locale/Makefile
 	@for i in locale/?? locale/??_??; do rm -rf $$i; done
-	@echo "all:" >>GNUmakefile
-	@echo -e "\t@echo" >>GNUmakefile
-	@echo -e "\t@echo \"Please create a Makefile by entering \\\"bash configure\\\" first\"" >>GNUmakefile
-	@echo -e "\t@echo" >>GNUmakefile
 
 # There might be a not executable simple-md5sum from a compiler run
 # under a different architecture, so make sure we have a working binary

Makefile

@@ -4,8 +4,9 @@
 
 all:
 	@echo
-	@echo "dvdisaster requires GNU make to build."
-	@echo "Please try your command again using gmake."
+	@echo "Please run \`bash configure' first."
+	@echo "Note that dvdisaster requires GNU make to build."
+	@echo "Under non-Linux systems, it might be known as \`gmake'."
 	@echo
 
 show: all

build.h

@@ -1,2 +0,0 @@
-#define BUILD 272
-#define BDATE "17.11.17 (Freitag, 09:57)"

documentation/config/version.tex

@@ -1 +0,0 @@
-\newcommand{\projectversion}{0.79.6}