extended_image_info: Add text_delta field

Needed to offset a symbol address read from the symbol table to the
actual load address.

headers/private/system/image_defs.h

@@ -19,6 +19,7 @@
 
 typedef struct extended_image_info {
 	image_info	basic_info;
+	ssize_t		text_delta;
 	void*		symbol_table;
 	void*		symbol_hash;
 	void*		string_table;

src/system/kernel/elf.cpp

@@ -2065,6 +2065,7 @@ elf_load_user_image(const char *path, Team *team, int flags, addr_t *entry)
 		// the runtime loader is loaded, so this is good enough for the time
 		// being.
 
+	imageInfo.text_delta = delta;
 	imageInfo.symbol_table = image->syms;
 	imageInfo.symbol_hash = image->symhash;
 	imageInfo.string_table = image->strtab;

src/system/kernel/team.cpp

@@ -1612,6 +1612,7 @@ team_create_thread_start_internal(void* args)
 		return err;
 	}
 	imageInfo.basic_info.text = team->commpage_address;
+	imageInfo.text_delta = 0;
 	imageInfo.symbol_table = NULL;
 	imageInfo.symbol_hash = NULL;
 	imageInfo.string_table = NULL;

src/system/runtime_loader/images.cpp

@@ -522,6 +522,7 @@ register_image(image_t* image, int fd, const char* path)
 	info.basic_info.data_size = dataEnd - dataBase;
 	info.basic_info.api_version = image->api_version;
 	info.basic_info.abi = image->abi;
+	info.text_delta = image->regions[0].delta;
 	info.symbol_table = image->syms;
 	info.symbol_hash = image->symhash;
 	info.string_table = image->strtab;