[build][android] set INSTALL_RPATH properly for shared libraries

Host libraries will likely all need ORIGIN set, whereas only set it for
target libraries that will be packaged with a native toolchain on Android.

Author: finagolfin

cmake/modules/AddSwift.cmake

@@ -628,14 +628,9 @@ function(_add_swift_host_library_single target)
       PROPERTIES
       INSTALL_RPATH "$ORIGIN:/usr/lib/swift/cygwin")
   elseif("${SWIFT_HOST_VARIANT_SDK}" STREQUAL "ANDROID")
-    # Only set the install RPATH if cross-compiling the host tools, in which
-    # case both the NDK and Sysroot paths must be set.
-    if(NOT "${SWIFT_ANDROID_NDK_PATH}" STREQUAL "" AND
-       NOT "${SWIFT_ANDROID_NATIVE_SYSROOT}" STREQUAL "")
-      set_target_properties("${target}"
-        PROPERTIES
-        INSTALL_RPATH "$ORIGIN")
-    endif()
+    set_target_properties("${target}"
+      PROPERTIES
+      INSTALL_RPATH "$ORIGIN")
   endif()
 
   set_target_properties("${target}" PROPERTIES BUILD_WITH_INSTALL_RPATH YES)

stdlib/cmake/modules/AddSwiftStdlib.cmake

@@ -527,10 +527,9 @@ function(_add_swift_target_library_single target name)
     if(SWIFTLIB_SINGLE_TARGET_LIBRARY)
       set_target_properties("${target}" PROPERTIES NO_SONAME TRUE)
     endif()
-    # Only set the install RPATH if cross-compiling the host tools, in which
-    # case both the NDK and Sysroot paths must be set.
-    if(NOT "${SWIFT_ANDROID_NDK_PATH}" STREQUAL "" AND
-       NOT "${SWIFT_ANDROID_NATIVE_SYSROOT}" STREQUAL "")
+    # Only set the install RPATH if the toolchain and stdlib will be in Termux
+    # or some other native sysroot on Android.
+    if(NOT "${SWIFT_ANDROID_NATIVE_SYSROOT}" STREQUAL "")
       set_target_properties("${target}"
         PROPERTIES
         INSTALL_RPATH "$ORIGIN")