fix inverted setting of sh fdpic flag by binutils

the behavior by bfd/ld matched the ABI document but was the opposite
of the kernel's interpretation and opposite of how ld treats the flag
on every other target using fdpic.

see this thread for details:
https://sourceware.org/ml/binutils/2015-09/msg00186.html

patches/binutils-2.25.1/0004-shfdpicflag.diff

@@ -0,0 +1,21 @@
+diff -ur binutils-2.25.1.orig/bfd/elf32-sh.c binutils-2.25.1/bfd/elf32-sh.c
+--- binutils-2.25.1.orig/bfd/elf32-sh.c	2015-09-03 21:52:17.000000000 +0000
++++ binutils-2.25.1/bfd/elf32-sh.c	2015-09-14 17:08:48.114426847 +0000
+@@ -5487,7 +5487,7 @@
+ 		   input_bfd, input_section, rel->r_offset, symname);
+ 	    }
+ 
+-	  elf_elfheader (output_bfd)->e_flags &= ~EF_SH_PIC;
++	  elf_elfheader (output_bfd)->e_flags |= EF_SH_PIC;
+ 	}
+ 
+       if (r != bfd_reloc_ok)
+@@ -6644,7 +6644,7 @@
+       elf_elfheader (obfd)->e_flags = elf_elfheader (ibfd)->e_flags;
+       sh_elf_set_mach_from_flags (obfd);
+       if (elf_elfheader (obfd)->e_flags & EF_SH_FDPIC)
+-	elf_elfheader (obfd)->e_flags |= EF_SH_PIC;
++	elf_elfheader (obfd)->e_flags &= ~EF_SH_PIC;
+     }
+ 
+   if (! sh_merge_bfd_arch (ibfd, obfd))