ndk-patches: remove wait3 patch from sys/wait.h

It was added specifically for busybox, and busybox > 1.33 now
implements its own workaround, so should hopefully be no need for this
patch anymore.

ndk-patches/sys-wait.h.patch

@@ -1,13 +0,0 @@
-diff -uNr sysroot.orig/usr/include/sys/wait.h sysroot/usr/include/sys/wait.h
---- sysroot.orig/usr/include/sys/wait.h	2019-02-12 16:12:24.000000000 +0000
-+++ sysroot/usr/include/sys/wait.h	2019-03-20 13:28:06.689331544 +0000
-@@ -46,6 +46,9 @@
- // Implemented as a static inline before 18.
- #endif
- 
-+/* Termux addition: Add wait3() declaration used by busybox. Available in libc for 32-bit only. */
-+static pid_t wait3(int* status, int options, struct rusage* rusage) { return wait4(-1, status, options, rusage); }
-+
- /* Posix states that idtype_t should be an enumeration type, but
-  * the kernel headers define P_ALL, P_PID and P_PGID as constant macros
-  * instead.

scripts/build/termux_step_start_build.sh

@@ -2,7 +2,7 @@ termux_step_start_build() {
 	TERMUX_STANDALONE_TOOLCHAIN="$TERMUX_COMMON_CACHEDIR/android-r${TERMUX_NDK_VERSION}-api-${TERMUX_PKG_API_LEVEL}"
 	# Bump the below version if a change is made in toolchain setup to ensure
 	# that everyone gets an updated toolchain:
-	TERMUX_STANDALONE_TOOLCHAIN+="-v6"
+	TERMUX_STANDALONE_TOOLCHAIN+="-v7"
 
 	# shellcheck source=/dev/null
 	source "$TERMUX_PKG_BUILDER_SCRIPT"