Fix relocs_info declaration in tcc.h

C standard specifies that array should be declared with a non null size
or with * for standard array. Declaration of relocs_info in tcc.h was
not respecting this rule. This commit add a R_NUM macro that maps to the
R_<ARCH>_NUM macros and declare relocs_info using it. This commit also
moves all linker-related macros from <arch>-gen.c files to <arch>-link.c
ones.

arm-link.c

@@ -1,7 +1,31 @@
-#include "tcc.h"
+#ifdef TARGET_DEFS_ONLY
+
+#define EM_TCC_TARGET EM_ARM
+
+/* relocation type for 32 bit data relocation */
+#define R_DATA_32   R_ARM_ABS32
+#define R_DATA_PTR  R_ARM_ABS32
+#define R_JMP_SLOT  R_ARM_JUMP_SLOT
+#define R_GLOB_DAT  R_ARM_GLOB_DAT
+#define R_COPY      R_ARM_COPY
+
+#define R_NUM       R_ARM_NUM
+
+#define ELF_START_ADDR 0x00008000
+#define ELF_PAGE_SIZE  0x1000
+
 #define HAVE_SECTION_RELOC
 
-ST_DATA struct reloc_info relocs_info[] = {
+enum float_abi {
+    ARM_SOFTFP_FLOAT,
+    ARM_HARD_FLOAT,
+};
+
+#else /* !TARGET_DEFS_ONLY */
+
+#include "tcc.h"
+
+ST_DATA struct reloc_info relocs_info[R_NUM] = {
     INIT_RELOC_INFO (R_ARM_PC24, 1, AUTO_GOTPLT_ENTRY, 0)
     INIT_RELOC_INFO (R_ARM_CALL, 1, AUTO_GOTPLT_ENTRY, 0)
     INIT_RELOC_INFO (R_ARM_JUMP24, 1, AUTO_GOTPLT_ENTRY, 0)
@@ -248,3 +272,5 @@ void relocate(TCCState *s1, ElfW_Rel *rel, int type, char *ptr, addr_t addr, add
             return;
     }
 }
+
+#endif /* !TARGET_DEFS_ONLY */