iphonesimulator: make iOS 6 the minimum requirement

iOS 5 support isn't available in the Xcode 6 install; iOS 6 covers
phones starting at the 3GS, so should be a reasonable base line

Change-Id: I15572ec0dd73f1ffc88c58120c706384a01f2478

build/make/configure.sh

diff --git a/build/make/configure.sh b/build/make/configure.sh
index ab6687f..d07f877 100644
--- a/build/make/configure.sh
+++ b/build/make/configure.sh
@@ -788,8 +788,8 @@
             add_ldflags "-mmacosx-version-min=10.9"
             ;;
         *-iphonesimulator-*)
-            add_cflags  "-miphoneos-version-min=5.0"
-            add_ldflags "-miphoneos-version-min=5.0"
+            add_cflags  "-miphoneos-version-min=6.0"
+            add_ldflags "-miphoneos-version-min=6.0"
             osx_sdk_dir="$(xcrun --sdk iphonesimulator --show-sdk-path)"
             add_cflags  "-isysroot ${osx_sdk_dir}"
             add_ldflags "-isysroot ${osx_sdk_dir}"