Add SLIB_UNINSTALL_EXTRA_COMMAND to uninstall the things installed via

SLIB_INSTALL_EXTRA_COMMAND.
patch by Dave Yeo, daveryeo telus net

Originally committed as revision 10767 to svn://svn.ffmpeg.org/ffmpeg/trunk

common.mak

@@ -96,6 +96,7 @@ uninstall-libs:
 	-rm -f "$(SHLIBDIR)/$(SLIBNAME_WITH_MAJOR)" \
 	       "$(SHLIBDIR)/$(SLIBNAME)"            \
 	       "$(SHLIBDIR)/$(SLIBNAME_WITH_VERSION)"
+	-$(SLIB_UNINSTALL_EXTRA_CMD)
 	-rm -f "$(LIBDIR)/$(LIB)"
 
 uninstall-headers::

configure

@@ -1909,6 +1909,7 @@ if enabled shared; then
   echo "SLIBNAME_WITH_MAJOR=${SLIBNAME_WITH_MAJOR}" >> config.mak
   echo "SLIB_EXTRA_CMD=${SLIB_EXTRA_CMD}" >> config.mak
   echo "SLIB_INSTALL_EXTRA_CMD=${SLIB_INSTALL_EXTRA_CMD}" >> config.mak
+  echo "SLIB_UNINSTALL_EXTRA_CMD=${SLIB_UNINSTALL_EXTRA_CMD}" >> config.mak
 fi
 echo "LIB_INSTALL_EXTRA_CMD=${LIB_INSTALL_EXTRA_CMD}" >> config.mak
 echo "EXTRALIBS=$extralibs" >> config.mak