configure,cmake: remove -Wdeclaration-after-statement

this was superseded by the addition of -std=c99

BUG=aomedia:111

Change-Id: Ib89125b6f2e259b52ae35af26e882f9b02ef2c27
diff --git a/build/cmake/aom_configure.cmake b/build/cmake/aom_configure.cmake
index 8fc44c2..b2770d9 100644
--- a/build/cmake/aom_configure.cmake
+++ b/build/cmake/aom_configure.cmake
@@ -40,7 +40,6 @@
     message(FATAL_ERROR "C99 support by the compiler is required!")
   endif ()
   add_compiler_flag_if_supported("-Wall")
-  add_compiler_flag_if_supported("-Wdeclaration-after-statement")
   add_compiler_flag_if_supported("-Wdisabled-optimization")
   add_compiler_flag_if_supported("-Wextra")
   add_compiler_flag_if_supported("-Wfloat-conversion")
diff --git a/configure b/configure
index 9829c72..0bb3e5d 100755
--- a/configure
+++ b/configure
@@ -644,7 +644,6 @@
     if enabled gcc; then
         enabled werror && check_add_cflags -Werror
         check_add_cflags -Wall
-        check_add_cflags -Wdeclaration-after-statement
         check_add_cflags -Wdisabled-optimization
         check_add_cflags -Wfloat-conversion
         check_add_cflags -Wpointer-arith