crypto++: remove unnecessary PREFIX=, clean up

srcpkgs/crypto++/template

@@ -5,7 +5,6 @@ version=8.3.0
 revision=1
 wrksrc="${pkgname//+/p}-CRYPTOPP_${version//./_}"
 build_style=gnu-makefile
-make_build_args="PREFIX=/usr"
 make_build_target="dynamic static libcryptopp.pc"
 make_install_target="install-lib"
 short_desc="Free C++ class library of cryptographic schemes"
@@ -21,11 +20,6 @@ if [ "$XBPS_CROSS" ]; then
 	make_build_args+=" -f GNUmakefile-cross"
 fi
 
-do_check() {
-	# The gnu-makefile build style does not use ${makejobs}
-	make ${makejobs} ${make_build_args} check
-}
-
 post_install() {
 	vlicense License.txt LICENSE
 }