msr-tools: Explicitly set EXTRA_OEMAKE as required

This recipe currently relies on EXTRA_OEMAKE having been to set to
"-e MAKEFLAGS=" in bitbake.conf to operate. It is necessary to make
this explicit so that the default in bitbake.conf can be changed.

Without this it fails with:
  msr-tools-1.3-r0 do_package_qa: QA Issue: Architecture did not match (3 to 62)
because it will build for host architecture

Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>

meta-oe/recipes-devtools/msr-tools/msr-tools_1.3.bb

@@ -12,6 +12,8 @@ S = "${WORKDIR}/msr-tools-master"
 
 COMPATIBLE_HOST = '(i.86|x86_64).*-linux'
 
+EXTRA_OEMAKE = "-e MAKEFLAGS="
+
 do_install() {
     install -d ${D}${sbindir}
     install -m 0755 rdmsr ${D}${sbindir}