Tests: Improve feature testing for skipping.

Fixed a bug where test_compress_* would all fail if arm64 or armthumb
filters were enabled for compression but arm was disabled. Since the
grep tests only checked for "define HAVE_ENCODER_ARM", this would match
on HAVE_ENCODER_ARM64 or HAVE_ENCODER_ARMTHUMB.

Now the config.h feature test requires " 1" at the end to prevent the
prefix problem. have_feature() was also updated for this even though
there were known current bugs affecting it. This is just in case future
features have a similar prefix problem.

tests/test_compress.sh

@@ -130,8 +130,8 @@ test_xz -4
 
 test_filter()
 {
-	grep "define HAVE_ENCODER_$1" ../config.h > /dev/null || return
+	grep "define HAVE_ENCODER_$1 1" ../config.h > /dev/null || return
-	grep "define HAVE_DECODER_$1" ../config.h > /dev/null || return
+	grep "define HAVE_DECODER_$1 1" ../config.h > /dev/null || return
 	shift
 	test_xz "$@" --lzma2=dict=64KiB,nice=32,mode=fast
 }

tests/test_files.sh

@@ -35,7 +35,7 @@ fi
 EXIT_STATUS=0
 have_feature()
 {
-	grep "define HAVE_$1" ../config.h > /dev/null && return 0
+	grep "define HAVE_$1 1" ../config.h > /dev/null && return 0
 	printf '%s: Skipping because HAVE_%s is not enabled\n' "$2" "$1"
 	EXIT_STATUS=77
 	return 1