Add vla61.c to demonstrate FAM of fixed size strings

doc/flex-array-members/.gitignore

@@ -1,3 +1,4 @@
 famcopy
 famsize
 gcc-fam
+vla61

doc/flex-array-members/vla61.c

@@ -0,0 +1,27 @@
+/* Demonstrating a FAM of fixed size strings */
+#include <assert.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+typedef struct VLA
+{
+    int num;
+    char vla[][32];
+} VLA;
+
+int main(void)
+{
+    int num = 10;
+    VLA *vla = malloc(sizeof(VLA) + num * sizeof(vla->vla[0]));
+    assert(vla != 0);       // Lousy test mechanism!
+    for (int i = 0; i < num; i++)
+        strcpy(vla->vla[i], "Arbitrary medium length string");
+    vla->num = num;
+
+    for (int i = 0; i < vla->num; i++)
+        printf("%d: [%s]\n", i, vla->vla[i]);
+
+    free(vla);
+    return 0;
+}