t/*: rearrange tests into numbered directories.

It was getting way too ad-hoc in there.  Let's reorganize the tests so that
there's a good, obvious, suggested sequence to run them in.

t/111-compile/.gitignore

@@ -0,0 +1,3 @@
+*.o
+CC
+hello

t/111-compile/CC.do

@@ -0,0 +1,11 @@
+redo-ifchange config.sh
+. ./config.sh
+exec >$3
+cat <<-EOF
+	redo-ifchange \$2.c
+	gcc $CFLAGS -MD -MF \$3.deps -o \$3 -c \$2.c
+	read DEPS <\$3.deps
+	rm -f \$3.deps
+	redo-ifchange \${DEPS#*:}
+EOF
+chmod +x $3

t/111-compile/Makefile

@@ -0,0 +1,6 @@
+all:
+
+%: FORCE
+	+redo $@
+
+.PHONY: FORCE

t/111-compile/all.do

@@ -0,0 +1 @@
+redo-ifchange hello

t/111-compile/clean.do

@@ -0,0 +1 @@
+rm -f *.tmp *~ *.o hello CC

t/111-compile/config.sh

@@ -0,0 +1 @@
+CFLAGS="-Wall"

t/111-compile/default.o.do

@@ -0,0 +1,2 @@
+redo-ifchange CC
+. ./CC "$@"

t/111-compile/hello.do

@@ -0,0 +1,4 @@
+DEPS="main.o
+mystr.o"
+redo-ifchange $DEPS
+gcc -o $3 $DEPS

t/111-compile/main.c

@@ -0,0 +1,8 @@
+#include <stdio.h>
+#include "mystr.h"
+
+int main()
+{
+    printf("%s\n", mystr);
+    return 0;
+}

t/111-compile/mystr.c

@@ -0,0 +1,4 @@
+
+#include "mystr.h"
+
+char *mystr = "Hello, world!";

t/111-compile/mystr.h

@@ -0,0 +1,6 @@
+#ifndef __MYSTR_H
+#define __MYSTR_H
+
+extern char *mystr;
+
+#endif