check for inline asm support

Originally committed as revision 12270 to svn://svn.ffmpeg.org/ffmpeg/trunk

configure

@@ -732,6 +732,7 @@ HAVE_LIST="
     getrusage
     imlib2
     inet_aton
+    inline_asm
     libdc1394_1
     libdc1394_2
     llrint
@@ -1509,6 +1510,8 @@ if test "$?" != 0; then
     die "C compiler test failed."
 fi
 
+check_asm inline_asm '""'
+
 if enabled x86; then
     # check whether EBP is available on x86
     # As 'i' is stored on the stack, this program will crash