gcc-6: Sync gcc stddef.h with musl stddef.h

GCC provides some of std* headers including stddef.h and it syncs with glibc definitions via __needed* defines to find which datatypes are expected to be defined on top of glibc. we need same for musl.

Drop unused 0048-ARM-PR-target-71056-Don-t-use-vectorized-builtins-wh.patch

---
 meta/recipes-devtools/gcc/gcc-6.3.inc              |  1 +
 ...et-71056-Don-t-use-vectorized-builtins-wh.patch | 92 ----------------------
 .../gcc-6.3/0048-sync-gcc-stddef.h-with-musl.patch | 91 +++++++++++++++++++++
 3 files changed, 92 insertions(+), 92 deletions(-)
 delete mode 100644 meta/recipes-devtools/gcc/gcc-6.3/0048-ARM-PR-target-71056-Don-t-use-vectorized-builtins-wh.patch
 create mode 100644 meta/recipes-devtools/gcc/gcc-6.3/0048-sync-gcc-stddef.h-with-musl.patch

index 0b84597a42..0f1b88bea7 100644
@@ -78,6 +78,7 @@ SRC_URI = "\
            file://0045-libgcc-Add-knob-to-use-ldbl-128-on-ppc.patch \
            file://0046-Link-libgcc-using-LDFLAGS-not-just-SHLIB_LDFLAGS.patch \
            file://0047-libgcc_s-Use-alias-for-__cpu_indicator_init-instead-.patch \
+           file://0048-sync-gcc-stddef.h-with-musl.patch \
            ${BACKPORTS} \
 "
 BACKPORTS = ""

2.11.0