Add sysutils dependency on Dos unit for msdos OS

rtl/msdos/Makefile

@@ -878,6 +878,7 @@ COMMON=$(RTL)/common
 PROCINC=../$(CPU_TARGET)
 UNITPREFIX=rtl
 SYSTEMUNIT=system
+SYSUTILS_DEPS_OS=$(DOSUNIT)$(PPUEXT)
 OBJPASDIR=$(RTL)/objpas
 ifdef EXCEPTIONS_IN_SYSTEM
 override FPCOPT+=-dEXCEPTIONS_IN_SYSTEM

rtl/msdos/Makefile.fpc

@@ -38,6 +38,9 @@ COMMON=$(RTL)/common
 PROCINC=../$(CPU_TARGET)
 UNITPREFIX=rtl
 SYSTEMUNIT=system
+# OS specific dependencies
+SYSUTILS_DEPS_OS=$(DOSUNIT)$(PPUEXT)
+
 
 # Paths
 OBJPASDIR=$(RTL)/objpas