microblaze: Remove support for gcc < 4

Since commit cafa0010 ("Raise the minimum required gcc version
to 4.6") , the kernel can no longer be compiled using gcc-3.
Hence drop support code for gcc-3.
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://lore.kernel.org/r/20210210141140.1506212-5-geert+renesas@glider.beSigned-off-by: Michal Simek <michal.simek@xilinx.com>

arch/microblaze/kernel/module.c

@@ -24,9 +24,6 @@ int apply_relocate_add(Elf32_Shdr *sechdrs, const char *strtab,
 	Elf32_Sym *sym;
 	unsigned long int *location;
 	unsigned long int value;
-#if __GNUC__ < 4
-	unsigned long int old_value;
-#endif
 
 	pr_debug("Applying add relocation section %u to %u\n",
 		relsec, sechdrs[relsec].sh_info);
@@ -49,40 +46,17 @@ int apply_relocate_add(Elf32_Shdr *sechdrs, const char *strtab,
 		 */
 
 		case R_MICROBLAZE_32:
-#if __GNUC__ < 4
-			old_value = *location;
-			*location = value + old_value;
-
-			pr_debug("R_MICROBLAZE_32 (%08lx->%08lx)\n",
-				old_value, value);
-#else
 			*location = value;
-#endif
 			break;
 
 		case R_MICROBLAZE_64:
-#if __GNUC__ < 4
-			/* Split relocs only required/used pre gcc4.1.1 */
-			old_value = ((location[0] & 0x0000FFFF) << 16) |
-					(location[1] & 0x0000FFFF);
-			value += old_value;
-#endif
 			location[0] = (location[0] & 0xFFFF0000) |
 					(value >> 16);
 			location[1] = (location[1] & 0xFFFF0000) |
 					(value & 0xFFFF);
-#if __GNUC__ < 4
-			pr_debug("R_MICROBLAZE_64 (%08lx->%08lx)\n",
-				old_value, value);
-#endif
 			break;
 
 		case R_MICROBLAZE_64_PCREL:
-#if __GNUC__ < 4
-			old_value = (location[0] & 0xFFFF) << 16 |
-				(location[1] & 0xFFFF);
-			value -= old_value;
-#endif
 			value -= (unsigned long int)(location) + 4;
 			location[0] = (location[0] & 0xFFFF0000) |
 					(value >> 16);