ping: Avoid magic numbers

[jlduran]

Summary

The sizeof(struct ip) is 20.
The sizeof(struct in_addr) is 4.
No functional change intended.

Test Plan

kyua test -k /usr/tests/Kyuafile sbin/ping/ping_test
kyua test -k /usr/tests/Kyuafile sbin/ping/test_ping.py

sbin/ping/ping.c

 .endif
 .if ${PORT_OPTIONS:MDYNAMIC}
 _EXECUTABLES+=  ${GHC_LIBDIR}/bin/ghc-iserv-dyn
 .endif
 
 .include <bsd.port.options.mk>
 
 .if empty(PORT_OPTIONS:MBOOT)
-.  if ${ARCH} == powerpc64 && ${OSVERSION} < 1300040
-ELF_V=                -elfv1
-.  endif
-DISTFILES+=                ghc-${BOOT_GHC_VERSION}-boot-${ARCH}-freebsd${ELF_V}${EXTRACT_SUFX}:boot
+BOOTSTRAPS_SUFFIX?=                ${BOOTSTRAPS_SUFFIX_${ARCH}}
+BOOTSTRAPS_SUFFIX_powerpc64?=        -${PPC_ABI:tl}
+DISTFILES+=                ghc-${BOOT_GHC_VERSION}-boot-${ARCH}-freebsd${BOOTSTRAPS_SUFFIX}${EXTRACT_SUFX}:boot
 .endif # MBOOT
 
 .if ${ARCH} == aarch64 || ${ARCH} == armv6 || ${ARCH} == armv7
 # CONFIGURE_TARGET must to be the same as the llvm triple
 CONFIGURE_TARGET=        ${ARCH}-unknown-freebsd${"${ARCH:Maarch64}" != "":?:-gnueabihf}
 EXTRA_PATCHES+=         ${PATCHDIR}/extra-patch-aclocal.m4
 BUILD_DEPENDS+=                llc${LLVM_VERSION}:devel/llvm${LLVM_VERSION}
 RUN_DEPENDS+=                llc${LLVM_VERSION}:devel/llvm${LLVM_VERSION}

 
 .if empty(PORT_OPTIONS:MBOOT)
         @${REINPLACE_CMD} -e '/^mandir/d' ${BOOT_DIR}/mk/build.mk
         @${REINPLACE_CMD} -e '/^infodir/d' ${BOOT_DIR}/mk/build.mk
         @${REINPLACE_CMD} -e '/^docdir/d' ${BOOT_DIR}/mk/build.mk
         @${REINPLACE_CMD} -e '/^htmldir/d' ${BOOT_DIR}/mk/build.mk
 .endif
 
-# XXX osversion powerpc64 elfv2
-.if ${OSVERSION} >= 1300040
+.if ${ARCH} == powerpc64 && ${PPC_ABI} == ELFv2
         @${REINPLACE_CMD} -e 's/ELF_V1/ELF_V2/' \
                 ${WRKSRC}/configure ${WRKSRC}/aclocal.m4
 .endif
 
 pre-configure: apply-slist
         # Copy the subbed build.mk to the proper position
         ${CP} ${WRKDIR}/build.mk ${WRKSRC}/mk/build.mk