select the build type

Belonging to [master]:
  - #70
  - OpenModelica/OMCompiler#2209
  - OpenModelica/OMCompiler-3rdParty#29

Author: adrpo

Makefile.omdev.mingw

@@ -26,9 +26,13 @@ OSG_PATH = $(OMDEVMSYS)/tools/msys/mingw64/
 PKG_CONFIG_PATH=$(OMDEVMSYS)/tools/msys/mingw64/lib/pkgconfig
 endif
 ifeq ($(BUILDTYPE),)
+BUILDTYPE=$(BuildType)
+endif
+ifeq ($(BUILDTYPE),)
 BUILDTYPE=Debug
 endif
 
+
 .PHONY: omc omc-diff omlibrary-core omplot omedit omnotebook omshell omoptim
 
 all: omc omc-diff omlibrary-core