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.

c67-link.c

@@ -1,6 +1,25 @@
-#include "tcc.h"
+#ifdef TARGET_DEFS_ONLY
+
+#define EM_TCC_TARGET EM_C60
+
+/* relocation type for 32 bit data relocation */
+#define R_DATA_32   R_C60_32
+#define R_DATA_PTR  R_C60_32
+#define R_JMP_SLOT  R_C60_JMP_SLOT
+#define R_GLOB_DAT  R_C60_GLOB_DAT
+#define R_COPY      R_C60_COPY
+
+#define R_NUM       R_C60_NUM
+
+#define ELF_START_ADDR 0x00000400
+#define ELF_PAGE_SIZE  0x1000
+
 #define HAVE_SECTION_RELOC
 
+#else /* !TARGET_DEFS_ONLY */
+
+#include "tcc.h"
+
 void relocate_init(Section *sr) {}
 
 void relocate(TCCState *s1, ElfW_Rel *rel, int type, char *ptr, addr_t addr, addr_t val)
@@ -33,3 +52,5 @@ void relocate(TCCState *s1, ElfW_Rel *rel, int type, char *ptr, addr_t addr, add
             break;
     }
 }
+
+#endif /* !TARGET_DEFS_ONLY */