dev-R/*: remove AR export no more needed

Signed-off-by: Alessandro Barbieri <lssndrbarbieri@gmail.com>

dev-R/Matrix/Matrix-1.3.4.ebuild

@@ -5,7 +5,7 @@ EAPI=7
 
 MYPV="$(ver_rs 2 -)"
 
-inherit R-packages toolchain-funcs
+inherit R-packages
 
 DESCRIPTION='Sparse and Dense Matrix Classes and Methods'
 KEYWORDS="~amd64"
@@ -17,8 +17,3 @@ DEPEND="
 	virtual/lattice
 "
 RDEPEND="${DEPEND}"
-
-src_prepare() {
-	tc-export AR
-	R-packages_src_prepare
-}