freeswitch: remove leftover patch

This patch was used in 1.10.4 but now it's not used anymore because the
external spandsp3 package is used. Drop the file.

Signed-off-by: Sebastian Kemper <sebastian_ml@gmx.net>

net/freeswitch/files/spandsp-flags.patch

@@ -1,18 +0,0 @@
---- a/libs/spandsp/configure.ac
-+++ b/libs/spandsp/configure.ac
-@@ -21,9 +21,12 @@
- AC_PREREQ([2.59])
- AC_INIT([spandsp], [1.99.0])
-
--CFLAGS="$CFLAGS $CONFIGURE_CFLAGS"
--CXXFLAGS="$CXXFLAGS $CONFIGURE_CXXFLAGS"
--LDFLAGS="$LDFLAGS $CONFIGURE_LDFLAGS"
-+m4_include(../apr/build/apr_common.m4)
-+
-+APR_ADDTO(CFLAGS, [$CONFIGURE_CFLAGS])
-+APR_ADDTO(CPPFLAGS, [$CONFIGURE_CPPFLAGS])
-+APR_ADDTO(CXXFLAGS, [$CONFIGURE_CXXFLAGS])
-+APR_ADDTO(LDFLAGS, [$CONFIGURE_LDFLAGS])
-
- SPANDSP_LT_CURRENT=3
- SPANDSP_LT_REVISION=0