scripts(ndk-patches/28c): use the new __BIONIC_AVAILABILITY_GUARD instead of the older and mostly removed __ANDROID_API__

Author: finagolfin

ndk-patches/28c/fcntl.h.patch

@@ -5,7 +5,7 @@ diff -u -r /home/builder/lib/android-ndk-r28b/toolchains/llvm/prebuilt/linux-x86
  /** Flag for splice(). */
  #define SPLICE_F_GIFT 8
 
-+#if __ANDROID_API__ >= 26
++#if __BIONIC_AVAILABILITY_GUARD(26)
  /** Flag for sync_file_range(). */
  #define SYNC_FILE_RANGE_WAIT_BEFORE 1
  /** Flag for sync_file_range(). */

ndk-patches/28c/time.h.patch

@@ -4,7 +4,7 @@
 
  __BEGIN_DECLS
 
-+#if __ANDROID_API__ >= 35
++#if __BIONIC_AVAILABILITY_GUARD(35)
  /* If we just use void* in the typedef, the compiler exposes that in error messages. */
  struct __timezone_t;
 

scripts/build/termux_step_setup_toolchain.sh

@@ -7,7 +7,7 @@ termux_step_setup_toolchain() {
 		# toolchain setup to ensure that everyone gets an updated
 		# toolchain
 		if [ "${TERMUX_NDK_VERSION}" = "28c" ]; then
-			TERMUX_STANDALONE_TOOLCHAIN+="-v1"
+			TERMUX_STANDALONE_TOOLCHAIN+="-v2"
 			termux_setup_toolchain_28c
 		elif [ "${TERMUX_NDK_VERSION}" = 23c ]; then
 			TERMUX_STANDALONE_TOOLCHAIN+="-v8"