Refactor and clean up gettext management

cmake/Modules/FindGettextLib.cmake

@@ -0,0 +1,48 @@
+# Package finder for gettext libs and include files
+
+SET(CUSTOM_GETTEXT_PATH "${PROJECT_SOURCE_DIR}/../../gettext"
+	CACHE FILEPATH "path to custom gettext")
+
+# by default
+SET(GETTEXT_FOUND FALSE)
+
+FIND_PATH(GETTEXT_INCLUDE_DIR
+	NAMES libintl.h
+	PATHS "${CUSTOM_GETTEXT_PATH}/include"
+	DOC "gettext include directory")
+
+FIND_PROGRAM(GETTEXT_MSGFMT
+	NAMES msgfmt
+	PATHS "${CUSTOM_GETTEXT_PATH}/bin"
+	DOC "path to msgfmt")
+
+# modern Linux, as well as Mac, seem to not need require special linking
+# TODO check the requirements on other BSDs and older Linux
+IF (WIN32)
+	FIND_LIBRARY(GETTEXT_LIBRARY
+		NAMES libintl.lib intl.lib libintl3.lib intl3.lib
+		PATHS "${CUSTOM_GETTEXT_PATH}/lib"
+		DOC "gettext *intl*.lib")
+	FIND_LIBRARY(GETTEXT_DLL
+		NAMES libintl.dll intl.dll libintl3.dll intl3.dll
+		PATHS "${CUSTOM_GETTEXT_PATH}/lib"
+		DOC "gettext *intl*.dll")
+	FIND_LIBRARY(GETTEXT_ICONV_DLL
+		NAMES libiconv2.dll
+		PATHS "${CUSTOM_GETTEXT_PATH}/lib"
+		DOC "gettext *iconv*.lib")
+ENDIF(WIN32)
+
+
+IF(GETTEXT_INCLUDE_DIR AND GETTEXT_MSGFMT)
+	IF (WIN32)
+		# in the Win32 case check also for the extra linking requirements
+		IF(GETTEXT_LIBRARY AND GETTEXT_DLL AND GETTEXT_ICONV_DLL)
+			SET(GETTEXT_FOUND TRUE)
+		ENDIF()
+	ELSE(WIN32)
+		SET(GETTEXT_FOUND TRUE)
+	ENDIF(WIN32)
+ENDIF()
+
+