liblzma: Fix build on old Linux/glibc on ARM64

getauxval() can be available even if HWCAP_CRC32 isn't #defined, so
both have to be checked. HWCAP_CRC32 was added in glibc 2.24 (2016).

Fixes: #190

Author: Larhzu

src/liblzma/check/crc32_arm64.h

@@ -23,7 +23,8 @@
 // If both versions are going to be built, we need runtime detection
 // to check if the instructions are supported.
 #if defined(CRC32_GENERIC) && defined(CRC32_ARCH_OPTIMIZED)
-#	if defined(HAVE_GETAUXVAL) || defined(HAVE_ELF_AUX_INFO)
+#	if (defined(HAVE_GETAUXVAL) && defined(HWCAP_CRC32)) \
+			|| defined(HAVE_ELF_AUX_INFO)
 #		include <sys/auxv.h>
 #	elif defined(_WIN32)
 #		include <processthreadsapi.h>
@@ -103,7 +104,7 @@ crc32_arch_optimized(const uint8_t *buf, size_t size, uint32_t crc)
 static inline bool
 is_arch_extension_supported(void)
 {
-#if defined(HAVE_GETAUXVAL)
+#if defined(HAVE_GETAUXVAL) && defined(HWCAP_CRC32)
 	return (getauxval(AT_HWCAP) & HWCAP_CRC32) != 0;
 
 #elif defined(HAVE_ELF_AUX_INFO)

src/liblzma/check/crc_common.h

@@ -89,7 +89,8 @@ extern const uint64_t lzma_crc64_table[4][256];
 // ARM64
 //
 // Keep this in sync with changes to crc32_arm64.h
-#if defined(_WIN32) || defined(HAVE_GETAUXVAL) \
+#if defined(_WIN32) \
+		|| (defined(HAVE_GETAUXVAL) && defined(HWCAP_CRC32)) \
 		|| defined(HAVE_ELF_AUX_INFO) \
 		|| (defined(__APPLE__) && defined(HAVE_SYSCTLBYNAME))
 #	define CRC_ARM64_RUNTIME_DETECTION 1