cmake: add warning for ignored MSGFMT_EXE

It does not make sense to attempt to set MSGFMT_EXE when NO_GETTEXT is
configured, as such add a check for NO_GETTEXT before attempting to set
it.

suggested-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Signed-off-by: Matthew Rogers <mattr94@gmail.com>

contrib/buildsystems/CMakeLists.txt

@@ -190,14 +190,18 @@ if(WIN32 AND NOT MSVC)#not required for visual studio builds
 	endif()
 endif()
 
-find_program(MSGFMT_EXE msgfmt)
-if(NOT MSGFMT_EXE)
-	if (USING_VCPKG)
-		set(MSGFMT_EXE ${CMAKE_SOURCE_DIR}/compat/vcbuild/vcpkg/downloads/tools/msys2/msys64/usr/bin/msgfmt.exe)
-	endif()
-	if(NOT EXISTS ${MSGFMT_EXE})
-		message(WARNING "Text Translations won't be built")
-		unset(MSGFMT_EXE)
+if(NO_GETTEXT)
+	message(STATUS "msgfmt not used under NO_GETTEXT")
+else()
+	find_program(MSGFMT_EXE msgfmt)
+	if(NOT MSGFMT_EXE)
+		if (USING_VCPKG)
+			set(MSGFMT_EXE ${CMAKE_SOURCE_DIR}/compat/vcbuild/vcpkg/downloads/tools/msys2/msys64/usr/bin/msgfmt.exe)
+		endif()
+		if(NOT EXISTS ${MSGFMT_EXE})
+			message(WARNING "Text Translations won't be built")
+			unset(MSGFMT_EXE)
+		endif()
 	endif()
 endif()