linux-user: Fix loaddr computation for some elf files

The file offset of the load segment is not relevant to the
low address, only the beginning of the virtual address page.

Cc: qemu-stable@nongnu.org
Fixes: a93934f ("elf: take phdr offset into account when calculating the program load address")
Resolves: https://gitlab.com/qemu-project/qemu/-/issues/1952
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Michael Tokarev <mjt@tls.msk.ru>
(cherry picked from commit 82d70a8)
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>

linux-user/elfload.c

@@ -3001,7 +3001,7 @@ static void load_elf_image(const char *image_name, int image_fd,
     for (i = 0; i < ehdr->e_phnum; ++i) {
         struct elf_phdr *eppnt = phdr + i;
         if (eppnt->p_type == PT_LOAD) {
-            abi_ulong a = eppnt->p_vaddr - eppnt->p_offset;
+            abi_ulong a = eppnt->p_vaddr & TARGET_PAGE_MASK;
             if (a < loaddr) {
                 loaddr = a;
             }