Fixed for veneers generated by linker for interworking

A compiler can do tail call optimizations, emitting
R_ARM_JUMP24 relocation instead of a normal call.

If this call has interworking (was from arm function to a thumb function
or vice versa), binutils produces a veneer, because it needs to do a
switch. By default these veneers do jumps to an absolute address. This
patch forces ld to produce veneers for position independent binaries.

tldr; no need for `--no-optimize-sibling-calls` anymore, sibling calls
will ✨ work ✨

An example of veneer before this patch:

```
81000010 <__func_thumb_from_arm>:
81000010: e51ff004      ldr     pc, [pc, #-4]           @ 0x81000014 <$d>

81000014 <$d>:
81000014: 01 00 00 81   .word   0x81000001
```

and after:

```
81000010 <__func_thumb_from_arm>:
81000010: e59fc004      ldr     r12, [pc, #4]           @ 0x8100001c <$d>
81000014: e08fc00c      add     r12, pc, r12
81000018: e12fff1c      bx      r12

8100001c <$d>:
8100001c: e5 ff ff ff   .word   0xffffffe5

```

Author: nikarh

CMakeLists.txt

@@ -301,6 +301,7 @@ function(toolchain_deps toolchain_deps_dir toolchain_install_dir toolchain_suffi
             patch -d <SOURCE_DIR> -p3 -t -N < ${PROJECT_SOURCE_DIR}/patches/binutils/0001-vita.patch
             && patch -d <SOURCE_DIR> -p1 -t -N < ${PROJECT_SOURCE_DIR}/patches/binutils/0002-fix-broken-reloc.patch
             && patch -d <SOURCE_DIR> -p3 -t -N < ${PROJECT_SOURCE_DIR}/patches/binutils/0003-fix-elf-vaddr.patch
+            && patch -d <SOURCE_DIR> -p3 -t -N < ${PROJECT_SOURCE_DIR}/patches/binutils/0004-fix-interworking-veneers.patch
         CONFIGURE_COMMAND ${compiler_flags} ${wrapper_command} <SOURCE_DIR>/configure
         --build=${build_native}
         --host=${toolchain_host}

patches/binutils/0002-fix-broken-reloc.patch

@@ -4,7 +4,7 @@ diff -urN binutils-2.31.1.orig/bfd/elf32-arm.c binutils-2.31.1/bfd/elf32-arm.c
 @@ -13517,6 +13517,7 @@
  	  else
  	    unwind_type = 2;
- 
+	
 +	  elide = 0;
  	  if (elide && !bfd_link_relocatable (info))
  	    {

patches/binutils/0004-fix-interworking-veneers.patch

@@ -0,0 +1,13 @@
+diff --git a/ld/emultempl/armelf.em b/ld/emultempl/armelf.em
+index a9ac12d6..627c9086 100644
+--- a/src/binutils/ld/emultempl/armelf.em
++++ b/src/binutils/ld/emultempl/armelf.em
+@@ -41,7 +41,7 @@ static struct elf32_arm_params params =
+   BFD_ARM_STM32L4XX_FIX_NONE,	/* stm32l4xx_fix */
+   0,				/* no_enum_size_warning */
+   0,				/* no_wchar_size_warning */
+-  0,				/* pic_veneer */
++  1,				/* pic_veneer */
+   -1,				/* fix_cortex_a8 */
+   1,				/* fix_arm1176 */
+   -1,				/* merge_exidx_entries */