Add trivial makefile to build c programs

Makefile

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+CFLAGS=-std=c99
+
+all: stderr stdout bigger graph i numnorm numsum randarg

stderr.c

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+#include <stdio.h>
+
+int main(int argc, char **argv) {
+	for (int i = 1; i < argc; i++) {
+		fprintf(stderr, "%s", argv[i]);
+
+		if (i + 1 < argc) {
+			fprintf(stderr, " ");
+		}
+	}
+	fprintf(stderr, "\n");
+	return 0;
+}

stdout.c

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+#include <stdio.h>
+
+int main(int argc, char **argv) {
+	for (int i = 1; i < argc; i++) {
+		fprintf(stdout, "%s", argv[i]);
+
+		if (i + 1 < argc) {
+			fprintf(stdout, " ");
+		}
+	}
+	fprintf(stdout, "\n");
+	return 0;
+}