Fix build under MSYS2 MinGW-w64 (Windows)

- Under MSYS2 MinGW-w64 the filename of the hidapi import library
  is "libhidapi.dll.a". Add hidapi.dll to NAMES of findlibrary().
- Use SUFFIX ".dll" for libtempered and libtempered-util, which is
  typical under Windows in case of shared libraries. Result:
    libtempered.so -> libtempered.dll
    libtempered-util.so -> libtempered-util.dll

CMakeLists.txt

@@ -38,7 +38,8 @@ find_path(HIDAPI_HEADER_DIR hidapi.h
 )
 
 if (BUILD_HIDAPI_SHARED)
-	find_library(HIDAPI_LIB NAMES hidapi-hidraw hidapi-libusb
+	# Under MSYS2 MinGW-w64 the filename of the import library is libhidapi.dll.a
+	find_library(HIDAPI_LIB NAMES hidapi-hidraw hidapi-libusb hidapi.dll
 		PATHS ../hidapi ../hidapi.git
 		PATH_SUFFIXES linux/.libs libusb/.libs linux libusb mac
 		DOC "The location of the HIDAPI shared library file"

libtempered-util/CMakeLists.txt

@@ -12,6 +12,10 @@ if (BUILD_SHARED_LIB)
 		OUTPUT_NAME tempered-util
 		SOVERSION 0
 	)
+	if(MINGW)
+		set_target_properties(tempered-util-shared PROPERTIES
+		SUFFIX ".dll")
+	endif()
 	target_link_libraries(tempered-util-shared m)
 	if (DEFINED CMAKE_INSTALL_LIBDIR)
 		install(

libtempered/CMakeLists.txt

@@ -13,6 +13,10 @@ if (BUILD_SHARED_LIB)
 		OUTPUT_NAME tempered
 		SOVERSION 0
 	)
+	if(MINGW)
+		set_target_properties(tempered-shared PROPERTIES
+		SUFFIX ".dll")
+	endif()
 	if (DEFINED CMAKE_INSTALL_LIBDIR)
 		install(
 			TARGETS tempered-shared