MinGW should set FFLDFLAGS and not LDFLAGS so that the LDFLAGS env var works.

Originally committed as revision 5703 to svn://svn.ffmpeg.org/ffmpeg/trunk

configure

@@ -868,7 +868,8 @@ EOF
     if test "$mingwce" = "yes"; then
         protocols="no"
     fi
-    LDFLAGS=-Wl,--output-def,$(@:.dll=.def),--out-implib,lib$(SLIBNAME:$(SLIBSUF)=.dll.a)
+    #FIXME: This ignores --extra-ldflags.
+    FFLDFLAGS=-Wl,--output-def,$(@:.dll=.def),--out-implib,lib$(SLIBNAME:$(SLIBSUF)=.dll.a)
     SLIBPREF=""
     SLIBSUF=".dll"
     EXESUF=".exe"