Fix Android build on Windows (microsoft#21304)

- Pass a list of files instead of path separator-delimited string to project.files(). See this issue: gradle/gradle#19817
- Check for host (instead of target) being Windows when using fallback patch program.

Author: edgchen1

cmake/CMakeLists.txt

@@ -551,7 +551,7 @@ if(NOT WIN32 AND NOT CMAKE_SYSTEM_NAME STREQUAL "Android")
 endif()
 
 find_package(Patch)
-if (WIN32 AND NOT Patch_FOUND)
+if (CMAKE_HOST_WIN32 AND NOT Patch_FOUND)
     # work around CI machines missing patch from the git install by falling back to the binary in this repo.
     # replicate what happens in https://github.com/Kitware/CMake/blob/master/Modules/FindPatch.cmake but without
     # the hardcoded suffixes in the path to the patch binary.

java/build-android.gradle

@@ -105,7 +105,7 @@ task sourcesJar(type: Jar) {
 
 task javadoc(type: Javadoc) {
 	source = android.sourceSets.main.java.srcDirs
-	classpath += project.files(android.getBootClasspath().join(File.pathSeparator))
+	classpath += project.files(android.getBootClasspath())
 }
 
 task javadocJar(type: Jar, dependsOn: javadoc) {