Wndows builds: removed reference to now obsolete MinGW64 toolchain

plugins/samplesource/bladerf2input/bladerf2input.pro

@@ -24,7 +24,7 @@ INCLUDEPATH += ../../../sdrgui
 INCLUDEPATH += ../../../swagger/sdrangel/code/qt5/client
 INCLUDEPATH += ../../../devices
 
-MINGW32 || MINGW64 {
+MINGW32 {
     LIBBLADERF = "C:\Programs\bladeRF"
     INCLUDEPATH += $$LIBBLADERF/include
 }
@@ -55,7 +55,7 @@ LIBS += -L../../../sdrgui/$${build_subdir} -lsdrgui
 LIBS += -L../../../swagger/$${build_subdir} -lswagger
 LIBS += -L../../../devices/$${build_subdir} -ldevices
 
-MINGW32 || MINGW64 {
+MINGW32 {
     LIBS += -L$$LIBBLADERF/lib -lbladeRF
 }