Remove OS specific rules for msmouse unit and use MSMOUSEUNIT variable

rtl/go32v2/Makefile.fpc

@@ -10,7 +10,7 @@ units=system $(UUCHARUNIT) $(OBJPASUNIT) $(MACPASUNIT) $(ISO7185UNIT) $(EXTPASUN
       dos $(CMEMUNIT) $(SORTBASEUNIT) \
       sysutils classes $(MATHUNIT) $(TYPINFOUNIT) \
       $(CPUUNIT) $(MMXUNIT) $(GETOPTSUNIT) $(HEAPTRCUNIT) $(LINEINFOUNIT) $(LNFODWRFUNIT) $(CTYPESUNIT) $(FGLUNIT) \
-      msmouse $(CHARSETUNIT) $(CPALLUNIT) \
+      $(MSMOUSEUNIT) $(CHARSETUNIT) $(CPALLUNIT) \
       $(CHARACTERUNIT) $(FPWIDESTRINGUNIT) $(UNICODEDATAUNIT) \
       $(TYPESUNIT) $(SYSCONSTUNIT) $(RTLCONSTSUNIT) \
       $(SOFTFPUUNIT) $(SFPUX80UNIT) $(UFLOATX80UNIT) $(SFPU128UNIT) $(UFLOAT128UNIT)
@@ -142,10 +142,3 @@ ucomplex$(PPUEXT) : $(INC)/ucomplex.pp $(MATHUNIT)$(PPUEXT) system$(PPUEXT)
 	$(COMPILER) $(INC)/ucomplex.pp
 	$(EXECPPAS)
 
-#
-# Other system-dependent RTL Units
-#
-msmouse$(PPUEXT) : msmouse.pp system$(PPUEXT)
-	$(COMPILER) msmouse.pp
-	$(EXECPPAS)
-

rtl/msxdos/Makefile.fpc

@@ -10,7 +10,7 @@ units=system si_prc $(UUCHARUNIT) $(OBJPASUNIT) $(ISO7185UNIT) $(STRINGSUNIT) $(
 #$(UUCHARUNIT) $(OBJPASUNIT) $(STRINGSUNIT) dos $(HEAPTRCUNIT) $(LNFODWRFUNIT) $(SYSCONSTUNIT) sysutils \
 #      $(MATHUNIT) $(MACPASUNIT) $(ISO7185UNIT) $(EXTPASUNIT) $(RTLCONSTSUNIT) $(TYPINFOUNIT) $(CPUUNIT) $(TYPESUNIT) \
 #      $(GETOPTSUNIT) $(SORTBASEUNIT) $(FGLUNIT) classes \
-#      msmouse $(PORTSUNIT)  \
+#      $(MSMOUSEUNIT) $(PORTSUNIT)  \
 #      $(CHARSETUNIT) $(CPALLUNIT) $(CTYPESUNIT) \
 #      $(FPWIDESTRINGUNIT) $(CHARACTERUNIT) $(UNICODEDATAUNIT)
 #     $(CMEMUNIT)
@@ -106,9 +106,6 @@ classes$(PPUEXT) : classes.pp $(wildcard $(OBJPASDIR)/classes/*.inc) \
 #
 # Other system-dependent RTL Units
 #
-msmouse$(PPUEXT) : msmouse.pp system$(PPUEXT)
-        $(COMPILER) msmouse.pp $(REDIR)
-	$(EXECPPAS)
 
 si_prc$(PPUEXT) : system$(PPUEXT)
         $(COMPILER) si_prc.pp

rtl/watcom/Makefile.fpc

@@ -22,7 +22,7 @@ implicitunits=$(EXEINFOUNIT) $(CP_UNITS) $(UNICODEDATAUNIT)
 
 # dpmiexcp $(INITCUNIT) $(PORTSUNIT) profile dxeload emu387 \
 # printer graph classes \
-# msmouse video mouse keyboard vesamode
+# $(MSMOUSEUNIT) video mouse keyboard vesamode
 
 rsts=$(MATHUNIT) $(TYPINFOUNIT) classes $(SYSCONSTUNIT)
 
@@ -117,9 +117,3 @@ dxeload$(PPUEXT) : dxeload.pp system$(PPUEXT)
 emu387$(PPUEXT) : emu387.pp fpu$(OEXT) strings$(PPUEXT) dxeload$(PPUEXT) \
                   dpmiexcp$(PPUEXT)
 
-#
-# Other system-dependent RTL Units
-#
-
-msmouse$(PPUEXT) : msmouse.pp system$(PPUEXT)
-