Remove 32-bit assumptions from the ELF code.

Change-Id: I2c1f3d34c33685799aade8866eec44479ff9f963
diff --git a/libc/bionic/libc_init_static.cpp b/libc/bionic/libc_init_static.cpp
index a6b20eb..a60e414 100644
--- a/libc/bionic/libc_init_static.cpp
+++ b/libc/bionic/libc_init_static.cpp
@@ -67,16 +67,16 @@
 }
 
 static void apply_gnu_relro() {
-  Elf32_Phdr* phdr_start = reinterpret_cast<Elf32_Phdr*>(getauxval(AT_PHDR));
+  Elf_Phdr* phdr_start = reinterpret_cast<Elf_Phdr*>(getauxval(AT_PHDR));
   unsigned long int phdr_ct = getauxval(AT_PHNUM);
 
-  for (Elf32_Phdr* phdr = phdr_start; phdr < (phdr_start + phdr_ct); phdr++) {
+  for (Elf_Phdr* phdr = phdr_start; phdr < (phdr_start + phdr_ct); phdr++) {
     if (phdr->p_type != PT_GNU_RELRO) {
       continue;
     }
 
-    Elf32_Addr seg_page_start = PAGE_START(phdr->p_vaddr);
-    Elf32_Addr seg_page_end = PAGE_END(phdr->p_vaddr + phdr->p_memsz);
+    Elf_Addr seg_page_start = PAGE_START(phdr->p_vaddr);
+    Elf_Addr seg_page_end = PAGE_END(phdr->p_vaddr + phdr->p_memsz);
 
     // Check return value here? What do we do if we fail?
     mprotect(reinterpret_cast<void*>(seg_page_start), seg_page_end - seg_page_start, PROT_READ);