[osx] fix build failure for osx due to sed command for %.db.c rule

OSX doesn't like having the file input for sed before the command options.
Fails with error:

	sed: -e: No such file or directory
	sed: s/"/\\"/g: No such file or directory
	sed: -e: No such file or directory
	sed: s/^\(.*\)$/"\1\\n"/: No such file or directory
	sed: -e1s/^\(.*\)$/const char rom_db_data[] = \1/: No such file or directory
	sed: -e: No such file or directory
	sed: $s/^\(.*\)$/\1;/: No such file or directory

0 files changed, 0 insertions, 0 deletions