fix -D_GNU_SOURC typo in build/modmake.rules.in ALL_CXXFLAGS

git-svn-id: http://svn.freeswitch.org/svn/freeswitch/trunk@8650 d0543943-73ff-0310-b7d9-9358b9ac24b2

build/modmake.rules.in

@@ -35,7 +35,7 @@ SOLINK = @SOLINK@
 LDFLAGS=@SWITCH_AM_LDFLAGS@ @LDFLAGS@ $(OUR_LDFLAGS)
 
 ALL_CFLAGS   = $(LOCAL_CFLAGS) $(MOD_CFLAGS) @SWITCH_AM_CFLAGS@ @CFLAGS@ -D_GNU_SOURCE $(OUR_CFLAGS)
-ALL_CXXFLAGS   = $(LOCAL_CFLAGS) $(MOD_CFLAGS) @SWITCH_AM_CXXFLAGS@ @CXXFLAGS@ -D_GNU_SOURC $(OUR_CFLAGS)
+ALL_CXXFLAGS   = $(LOCAL_CFLAGS) $(MOD_CFLAGS) @SWITCH_AM_CXXFLAGS@ @CXXFLAGS@ -D_GNU_SOURCE $(OUR_CFLAGS)
 
 COMPILE      = $(CC) $(ALL_CFLAGS) $(DEFS)
 LTCOMPILE = $(LIBTOOL) --mode=compile --tag=CC $(COMPILE)