psx_build : fix link failing if output folder doesn't exist

Author: 50thomatoes50

PSXToolchain/psx_build.bat

@@ -7,6 +7,13 @@ rem Create a virtual drive
 SUBST X: %REDRIVER_FOLDER%\PSXToolchain
 
 set PATH=%PATH%;X:\mipsel-unknown-elf\bin;
+
+if exist %REDRIVER_FOLDER%\PSXToolchain\CDSrc\0_CD_DATA\ (
+  rem Yes
+) else (
+  mkdir %REDRIVER_FOLDER%\PSXToolchain\CDSrc\0_CD_DATA\
+)
+
 make
 
 rem Cleanup