gmp: also generate the libgmpcxx library & package it properly

configure runs few checks to make sure c++ compiler and runtime are working
as expected with the --enable-cxx=detect option. And it enables building
of libgmpxx library.

Same as earlier the libgmp.so.10.x file is packaged in the libgmp10 package,
and a new package named libgmpxx4 is added for libgmpxx.so.4.x file.

(From OE-Core rev: ac59ea9d55c2fae870fb60dbba920fefe1f3487f)

Signed-off-by: Nitin A Kamble <nitin.a.kamble@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-support/gmp/gmp.inc

@@ -14,3 +14,8 @@ ARM_INSTRUCTION_SET = "arm"
 acpaths = ""
 
 BBCLASSEXTEND = "native nativesdk"
+
+EXTRA_OECONF += " --enable-cxx=detect"
+
+PACKAGES =+ "libgmpxx"
+FILES_libgmpxx = "${libdir}/libgmpxx${SOLIBS}"

meta/recipes-support/gmp/gmp_5.0.2.bb

@@ -2,7 +2,7 @@ require gmp.inc
 LICENSE="LGPLv3&GPLv3"
 LIC_FILES_CHKSUM = "file://COPYING;md5=d32239bcb673463ab874e80d47fae504 \
 		    file://version.c;endline=18;md5=d8c56b52b9092346b9f93b4da65ef790"
-PR = "r1"
+PR = "r2"
 
 SRC_URI_append += "file://sh4-asmfix.patch \
                    file://use-includedir.patch "