elf: take phdr offset into account when calculating the program load address

The first program header does not necessarily start at offset 0. This change
corresponds to what the Linux kernel does in load_elf_binary().

Signed-off-by: Jonas Maebe <jonas.maebe@elis.ugent.be>
Signed-off-by: Riku Voipio <riku.voipio@linaro.org>

linux-user/elfload.c

@@ -1820,7 +1820,7 @@ static void load_elf_image(const char *image_name, int image_fd,
     loaddr = -1, hiaddr = 0;
     for (i = 0; i < ehdr->e_phnum; ++i) {
         if (phdr[i].p_type == PT_LOAD) {
-            abi_ulong a = phdr[i].p_vaddr;
+            abi_ulong a = phdr[i].p_vaddr - phdr[i].p_offset;
             if (a < loaddr) {
                 loaddr = a;
             }