gcc: Fix two QA issues

a) There is a QA warning from a .so being present in a main package.
   In the case of the plugin library for gcc, this is allowed.
b) Remove the unwanted libiberty.a file with the strange path. We
   don't need/want this and this removes an unpackaged file warning.

(From OE-Core rev: ca36a3edf9cede9fa0d73ba1a9538ab467cb5e3c)

(From OE-Core rev: 974677d32e0af74fab58d1b12b8d786b67323c5a)

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

meta/recipes-devtools/gcc/gcc-package-sdk.inc

@@ -19,6 +19,8 @@ FILES_${PN} = "\
     ${prefix}/${TARGET_SYS}/lib/* \
     ${prefix}/${TARGET_SYS}/usr/include/* \
     "
+INSANE_SKIP_${PN} += "dev-so"
+
 FILES_${PN}-doc = "\
     ${infodir} \
     ${mandir} \
@@ -40,6 +42,8 @@ do_install () {
 
 	# We use libiberty from binutils
 	rm -f ${D}${prefix}/${TARGET_SYS}/lib/libiberty.a
+	# Not sure where the strange paths come from
+	rm -f ${D}${libdir}/../lib/libiberty.a
 	rm -f ${D}${libdir}/libiberty.a
 
 	# Insert symlinks into libexec so when tools without a prefix are searched for, the correct ones are

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

@@ -24,6 +24,8 @@ FILES_${PN} = "\
   ${gcclibdir}/${TARGET_SYS}/${BINV}/include \
   ${gcclibdir}/${TARGET_SYS}/${BINV}/include-fixed \
 "
+INSANE_SKIP_${PN} += "dev-so"
+
 FILES_${PN}-dbg += "\
   ${libexecdir}/gcc/${TARGET_SYS}/${BINV}/.debug/ \
 "