Rename `reloc_addr` to suppress `-Wshadow` warning.

Here is the warning:
ldso/ldso/dl-elf.c: In function '_dl_fixup':
./ldso/include/dl-elf.h:259:37: warning: declaration of 'reloc_addr' shadows a previous local [-Wshadow]
  259 |                         ElfW(Addr) *reloc_addr = 0; \
      |                                     ^~~~~~~~~~
./ldso/include/dl-elf.h:290:33: note: in expansion of macro 'DL_DO_RELOCATE_RELR'
  290 |                                 DL_DO_RELOCATE_RELR(dyn->loadaddr, relr_start, relr_end); \
      |                                 ^~~~~~~~~~~~~~~~~~~
ldso/ldso/dl-elf.c:1032:9: note: in expansion of macro 'DL_RELOCATE_RELR'
 1032 |         DL_RELOCATE_RELR(tpnt);
      |         ^~~~~~~~~~~~~~~~
In file included from ldso/ldso/ldso.c:1462:
ldso/ldso/dl-elf.c:1012:20: note: shadowed declaration is here
 1012 |         ElfW(Addr) reloc_addr

Signed-off-by: Dmitry Chestnykh <dm.chestnykh@gmail.com>

ldso/include/dl-elf.h

@@ -256,22 +256,22 @@ unsigned int __dl_parse_dynamic_info(ElfW(Dyn) *dpnt, unsigned long dynamic_info
 #define DL_DO_RELOCATE_RELR(load_addr, relr_start, relr_end) \
 		do { \
 			const ElfW(Relr) *relr = 0; \
-			ElfW(Addr) *reloc_addr = 0; \
+			ElfW(Addr) *relr_reloc_addr = 0; \
 			for (relr = relr_start; relr < relr_end; relr++) { \
 				ElfW(Relr) relr_entry = *relr; \
 				if (!(relr_entry & 1)) \
 				{ \
-					reloc_addr = (ElfW(Addr) *)DL_RELOC_ADDR(load_addr, relr_entry); \
-					*reloc_addr = (ElfW(Addr))DL_RELOC_ADDR(load_addr, reloc_addr); \
-					reloc_addr++; \
+					relr_reloc_addr = (ElfW(Addr) *)DL_RELOC_ADDR(load_addr, relr_entry); \
+					*relr_reloc_addr = (ElfW(Addr))DL_RELOC_ADDR(load_addr, relr_reloc_addr); \
+					relr_reloc_addr++; \
 				} \
 				else \
 				{ \
 					for (long int i = 0; (relr_entry >>= 1) != 0; ++i) { \
 						if ((relr_entry & 1) != 0) \
-							reloc_addr[i] = (ElfW(Addr))DL_RELOC_ADDR(load_addr, reloc_addr[i]); \
+							relr_reloc_addr[i] = (ElfW(Addr))DL_RELOC_ADDR(load_addr, relr_reloc_addr[i]); \
 					} \
-					reloc_addr += CHAR_BIT * sizeof(ElfW(Relr)) - 1; \
+					relr_reloc_addr += CHAR_BIT * sizeof(ElfW(Relr)) - 1; \
 				} \
 			} \
 		} while (0);