Drop support for lz4 < 1.3.0

lz4-r130 was released on May 29th, 2015. Let's drop the work-around for older
versions. In particular, we won't test any new code against those ancient
releases, so we shouldn't pretend they are supported.

(cherry picked from commit e0a1d4b049e6991919a0eacd5d96f7f39dc6ddd1)

README

@@ -148,7 +148,7 @@ REQUIREMENTS:
         libacl (optional)
         libselinux (optional)
         liblzma (optional)
-        liblz4 >= 119 (optional)
+        liblz4 >= 1.3.0 / 130 (optional)
         libgcrypt (optional)
         libqrencode (optional)
         libmicrohttpd (optional)

meson.build

@@ -1082,6 +1082,7 @@ conf.set10('HAVE_XZ', have)
 want_lz4 = get_option('lz4')
 if want_lz4 != 'false' and not fuzzer_build
         liblz4 = dependency('liblz4',
+                            version : '>= 1.3.0',
                             required : want_lz4 == 'true')
         have = liblz4.found()
 else

src/journal/compress.c

@@ -95,11 +95,7 @@ int compress_blob_lz4(const void *src, uint64_t src_size,
         if (src_size < 9)
                 return -ENOBUFS;
 
-#if LZ4_VERSION_NUMBER >= 10700
         r = LZ4_compress_default(src, (char*)dst + 8, src_size, (int) dst_alloc_size - 8);
-#else
-        r = LZ4_compress_limitedOutput(src, (char*)dst + 8, src_size, (int) dst_alloc_size - 8);
-#endif
         if (r <= 0)
                 return -ENOBUFS;
 

src/journal/test-compress.c

@@ -207,11 +207,7 @@ static void test_lz4_decompress_partial(void) {
         memset(huge, 'x', HUGE_SIZE);
         memcpy(huge, "HUGE=", 5);
 
-#if LZ4_VERSION_NUMBER >= 10700
         r = LZ4_compress_default(huge, buf, HUGE_SIZE, buf_size);
-#else
-        r = LZ4_compress_limitedOutput(huge, buf, HUGE_SIZE, buf_size);
-#endif
         assert_se(r >= 0);
         compressed = r;
         log_info("Compressed %i → %zu", HUGE_SIZE, compressed);