Add x1 C example / improve extract.py to extract all sections after .text

x1/c/main.c

@@ -0,0 +1,14 @@
+void main() {
+    char *str = "Hello World";
+    int aa = 1234;
+    int i;
+    for (i=0; i<999; i++) {
+        asm volatile(
+            "mrc p15, 0, r10, c1, c0, 0\n"
+            "bic r10, #1\n"
+            "mcr p15, 0, r10, c1, c0, 0\n"
+            : "=r" (aa)
+        );
+        aa += 1;
+    }
+}

x1/c/start.S

@@ -0,0 +1,7 @@
+.align 2
+.global _start
+
+_start:
+    push {r4, lr}
+    bl main
+    pop {r4, pc}