Un-nest check_ver macro

RGBDS 0.4.2 made those invalid

Author: ISSOtm

structs.asm

@@ -66,19 +66,19 @@ TMP equs STRSUB("{\1}", 2, STRLEN("{\1}") - 1)
     ENDC
 ENDM
 
+check_ver: MACRO
+    IF \1 != \4 || \2 > \5 || \3 > \6
+        PURGE EXPECTED_VERSION
+    ENDC
+ENDM
 
 ; rgbds_structs_version version_string
 ; Call with the expected version string to ensure you're using a compatible version
 ; Example: rgbds_structs_version 1.0.0
 rgbds_structs_version: MACRO
-CURRENT_VERSION equs "1,2,1"
+CURRENT_VERSION equs "1,3,0"
 EXPECTED_VERSION equs "\1"
     strreplace EXPECTED_VERSION, ".", "\,"
-check_ver: MACRO
-    IF \1 != \4 || \2 > \5 || \3 > \6
-        PURGE EXPECTED_VERSION
-    ENDC
-ENDM
 
 CHECK_VER_CALL equs "check_ver {EXPECTED_VERSION},{CURRENT_VERSION}"
     CHECK_VER_CALL