gcc: Drop ARCH_FLAGS_FOR_TARGET usage

As far as I can tell this variable is now completely unneeded. It would
only ever get used in target builds and these are now correctly done
in the target environment namespace, not any of our cross environments.
As such, CC and other variables contain the correct compilers and other
tune options and these are correctly picked up when building libgcc,
libstdc++ and others.

I tried to figure out where else these would make any sense and couldn't
find anything. Builds appear fine without them so lets drop the complexity
including the patch adding in this flag to gcc.

(From OE-Core rev: 5484596f4252e707ff791feedf143a72dbb613f6)

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-devtools/gcc/gcc-4.8.inc

@@ -22,7 +22,6 @@ LIC_FILES_CHKSUM = "file://COPYING;md5=59530bdf33659b29e73d4adb9f9f6552 \
 		   file://COPYING.RUNTIME;md5=fe60d87048567d4fe8c8a0ed2448bcc8"
 
 SRC_URI = "${GNU_MIRROR}/gcc/gcc-${PV}/gcc-${PV}.tar.bz2 \
-	   file://0001-gcc-4.3.1-ARCH_FLAGS_FOR_TARGET.patch \
 	   file://0002-uclibc-conf.patch \
 	   file://0003-gcc-uclibc-locale-ctype_touplow_t.patch \
 	   file://0004-uclibc-locale.patch \

meta/recipes-devtools/gcc/gcc-configure-common.inc

@@ -68,11 +68,6 @@ CPPFLAGS = ""
 EXTRA_OECONF_append_powerpc = " --with-long-double-128"
 EXTRA_OECONF_append_powerpc64 = " --with-long-double-128"
 
-# Used by configure to define additional values for FLAGS_FOR_TARGET -
-# passed to all the compilers.
-ARCH_FLAGS_FOR_TARGET = "${TARGET_CC_ARCH}"
-EXTRA_OEMAKE += "ARCH_FLAGS_FOR_TARGET='${ARCH_FLAGS_FOR_TARGET}'"
-
 SYSTEMHEADERS = "${target_includedir}"
 SYSTEMLIBS = "${target_base_libdir}/"
 SYSTEMLIBS1 = "${target_libdir}/"
@@ -129,7 +124,6 @@ do_configure () {
 	export CPPFLAGS_FOR_BUILD="${BUILD_CPPFLAGS}"
 	export CXXFLAGS_FOR_BUILD="${BUILD_CXXFLAGS}"
 	export LDFLAGS_FOR_BUILD="${BUILD_LDFLAGS}"
-	export ARCH_FLAGS_FOR_TARGET="${ARCH_FLAGS_FOR_TARGET}"
 	export CFLAGS_FOR_TARGET="${TARGET_CFLAGS}"
 	export CPPFLAGS_FOR_TARGET="${TARGET_CPPFLAGS}"
 	export CXXFLAGS_FOR_TARGET="${TARGET_CXXFLAGS}"

meta/recipes-devtools/gcc/gcc-runtime.inc

@@ -7,8 +7,6 @@ EXTRA_OECONF_PATHS = " \
     --with-sysroot=${STAGING_DIR_TARGET} \
     --with-build-sysroot=${STAGING_DIR_TARGET}"
 
-ARCH_FLAGS_FOR_TARGET += "-isystem${STAGING_INCDIR}"
-
 EXTRA_OECONF += "--disable-libunwind-exceptions"
 EXTRA_OECONF_append_linuxstdbase = " --enable-clocale=gnu"
 

meta/recipes-devtools/gcc/gcc-target.inc

@@ -7,8 +7,6 @@ EXTRA_OECONF_PATHS = " \
     --with-native-system-header-dir=${STAGING_DIR_TARGET}${target_includedir} \
     --with-gxx-include-dir=${includedir}/c++/"
 
-ARCH_FLAGS_FOR_TARGET += "-isystem${STAGING_INCDIR} -I${B}/gcc/include/ "
-
 PACKAGES = "\
   ${PN} ${PN}-plugins ${PN}-symlinks \
   g++ g++-symlinks \