Add COMPAT_R_ARM_PREL31 patch to fix TH for armv6a android

Author: hamishmack

overlays/bootstrap.nix

@@ -316,6 +316,8 @@ in {
                 # See https://gitlab.haskell.org/ghc/ghc/-/issues/16130
                 ++ onAndroid (fromUntil "9.6.6" "9.12" ./patches/ghc/ghc-9.6-static-linker-script-support.patch)
                 ++ onAndroid (from      "9.12.1"       ./patches/ghc/ghc-9.12-static-linker-script-support.patch)
+
+                ++ onAndroid (from      "9.6"          ./patches/ghc/ghc-9.6-COMPAT_R_ARM_PREL31.patch)
                 ;
         in ({
             ghc8107 = traceWarnOld "8.10" (final.callPackage ../compiler/ghc {

overlays/patches/ghc/ghc-9.6-COMPAT_R_ARM_PREL31.patch

@@ -0,0 +1,13 @@
+diff --git a/rts/linker/Elf.c b/rts/linker/Elf.c
+index 007daedb2f..0555abac72 100644
+--- a/rts/linker/Elf.c
++++ b/rts/linker/Elf.c
+@@ -1295,6 +1295,7 @@ do_Elf_Rel_relocations ( ObjectCode* oc, char* ehdrC,
+            break;
+
+        case COMPAT_R_ARM_REL32:     /* ((S + A) | T) – P */
++       case COMPAT_R_ARM_PREL31:
+            *(Elf32_Word *)P += S;
+            *(Elf32_Word *)P |= T;
+            *(Elf32_Word *)P -= P;
+