For MinGW, statically link exes against basic runtimes

Avoids the need to ship basic runtimes like libgcc_s_sjlj-1.dll
with the executables.

CMakeLists.txt

@@ -24,6 +24,17 @@ elseif(${CMAKE_CXX_COMPILER_ID} MATCHES "Clang")
     add_definitions(-std=c++11)
 endif()
 
+function(glslang_set_link_args TARGET)
+    # For MinGW compiles, statically link against the GCC and C++ runtimes.
+    # This avoids the need to ship those runtimes as DLLs.
+    if(WIN32)
+	if(${CMAKE_CXX_COMPILER_ID} MATCHES "GNU")
+	    set_target_properties(${TARGET} PROPERTIES
+		    LINK_FLAGS "-static -static-libgcc -static-libstdc++")
+        endif()
+    endif(WIN32)
+endfunction(glslang_set_link_args)
+
 # We depend on these for later projects, so they should come first.
 add_subdirectory(External)