[Ada] vx7r2: do not include s-qnx.ads in the kernel and rtp runtimes

Target specific runtime files must be added to a the exclude list so the
files don't automatically get copied to other runtimes.

gcc/ada/

	* Makefile.rtl (ADA_EXCLUDE_SRCS): Add s-qnx.ads.
diff --git a/gcc/ada/Makefile.rtl b/gcc/ada/Makefile.rtl
index 03429f6..fc1aac9 100644
--- a/gcc/ada/Makefile.rtl
+++ b/gcc/ada/Makefile.rtl
@@ -2937,6 +2937,7 @@
   s-linux.ads  s-vxwext.adb s-vxwext.ads s-win32.ads  s-winext.ads \
   s-stchop.ads s-stchop.adb \
   s-strcom.adb s-strcom.ads s-thread.ads \
+  s-qnx.ads \
 
 # ADA_EXCLUDE_SRCS without the sources used by the target
 ADA_EXCLUDE_FILES=$(filter-out \