Try to set `rpath` for `--shared` build of PyPy (#244)

plugins/python-build/bin/python-build

@@ -804,8 +804,13 @@ pypy_architecture() {
 
 build_package_pypy() {
   build_package_copy
-  { if [ -x "${PREFIX_PATH}/bin/pypy" ] && [ ! -x "${PREFIX_PATH}/bin/python" ]; then
-      ( cd "${PREFIX_PATH}/bin" && ln -fs pypy python )
+  { if [ ! -x "${PREFIX_PATH}/bin/python" ]; then
+      if [ -x "${PREFIX_PATH}/bin/pypy" ]; then
+        ( cd "${PREFIX_PATH}/bin" && ln -fs "pypy" "python" )
+      else
+        echo "not a pypy binary distribution" 1>&3
+        return 1
+      fi
     fi
   } >&4 2>&1
 }
@@ -819,10 +824,14 @@ build_package_pypy_builder() {
     echo "not a pypy source tree" 1>&3
     return 1
   fi
-  if [ -x "pypy-c" ] && [ ! -x "bin/pypy" ]; then
-    mkdir -p "bin"
-    mv -f "pypy-c" "bin/pypy"
-  fi
+  { mkdir -p "bin" "lib"
+    if [ -x "pypy-c" ]; then
+      mv -f "pypy-c" "bin/pypy"
+    fi
+    for libpypy in "libpypy-c."*; do
+      mv -f "${libpypy}" "lib/"
+    done
+  } >&4 2>&1
   build_package_pypy
 }
 
@@ -1593,7 +1602,7 @@ if [ -n "$DEBUG" ]; then
   package_option python configure --with-pydebug
 fi
 
-# python-build: Set `RPATH` if `--enable-shared` was given (#65, #66, 82)
+# python-build: Set `RPATH` if `--enable-shared` was given (#65, #66, #82)
 if [[ "$CONFIGURE_OPTS" == *"--enable-shared"* ]] || [[ "$PYTHON_CONFIGURE_OPTS" == *"--enable-shared"* ]]; then
   # The ld on Darwin embeds the full paths to each dylib by default
   if [[ "$LDFLAGS" != *"-rpath="* ]] && [[ "Darwin" != "$(uname -s)" ]]; then
@@ -1601,6 +1610,11 @@ if [[ "$CONFIGURE_OPTS" == *"--enable-shared"* ]] || [[ "$PYTHON_CONFIGURE_OPTS"
   fi
 fi
 
+# python-build: Set `RPATH` if --shared` was given for PyPy (#244)
+if [[ "$PYPY_OPTS" == *"--shared"* ]]; then
+  export LDFLAGS="-Wl,-rpath=${PREFIX_PATH}/lib ${LDFLAGS}"
+fi
+
 # Add support for framework installation (`--enable-framework`) of CPython (#55, #99)
 if [[ "$PYTHON_CONFIGURE_OPTS" == *"--enable-framework"* ]]; then
   if [[ "Darwin" != "$(uname -s)" ]]; then