[BUILD] - fix generation of Autoconf.mo on msys/mingw

Belonging to [master]:
  - #3019

Author: adrpo

.gitignore

@@ -99,6 +99,8 @@ SimulationRuntime/build_c/
 SimulationRuntime/opc/ua/open62541.h
 SimulationRuntime/opc/ua/open62541.c
 SimulationRuntime/opc/ua/libomopcua.dll
+SimulationRuntime/OMSI/Build_dynamic/
+SimulationRuntime/OMSI/Build_static/
 
 # OpenModelicaSetup
 Compiler/OpenModelicaSetup

Compiler/boot/Makefile.omdev.mingw

@@ -55,7 +55,7 @@ LDFLAGS_SHARED_MAIN=-L"$(OMHOME)/$(LIB_OMC)" $(EXTRA_LD_FLAGS)
 default: all
 
 ../Util/Autoconf.mo: ../Util/Autoconf.mo.omdev.mingw
-	sed "s/ISMINGW64/$(ISMINGW64)/" "$<" > "$@.tmp"
+	sed "s/@ISMINGW64@/$(ISMINGW64)/" "$<" > "$@.tmp"
 	mv "$@.tmp" "$@"
 
 include Makefile.common