Fix build on Ubuntu 12.04 caused by old GCC

Former-commit-id: f32c21cd6377dda04a36f6cf3e8d91db15e54212

debian/patches/conditionally_define_alignas_for_precise.patch

@@ -0,0 +1,33 @@
+diff --git a/external/boringssl/crypto/internal.h b/external/boringssl/crypto/internal.h
+index e35fb7b..7bc1bea 100644
+--- a/external/boringssl/crypto/internal.h
++++ b/external/boringssl/crypto/internal.h
+@@ -117,6 +117,8 @@
+ #define alignas(x) __declspec(align(x))
+ #define alignof __alignof
+ #endif
++#elif defined(__GNUC__) && (__GNUC__ * 100 + __GNUC_MINOR__ <= 406)
++#define alignas(x) __attribute((aligned(x)))
+ #else
+ #include <stdalign.h>
+ #endif
+diff --git a/configure.ac b/configure.ac
+index a04424a..e67ce89 100644
+--- a/configure.ac
++++ b/configure.ac
+@@ -2994,7 +2994,6 @@ case "$host" in
+ 			AOT_SUPPORTED="yes"
+ 			BTLS_SUPPORTED=yes
+ 			BTLS_PLATFORM=i386
+-			AC_CHECK_HEADER(stdalign.h,[],[BTLS_SUPPORTED=no])
+ 			;;
+ 		  darwin*)
+ 			AOT_SUPPORTED="yes"
+@@ -3017,7 +3016,6 @@ case "$host" in
+ 			AOT_SUPPORTED="yes"
+ 			BTLS_SUPPORTED=yes
+ 			BTLS_PLATFORM=x86_64
+-			AC_CHECK_HEADER(stdalign.h,[],[BTLS_SUPPORTED=no])
+ 			;;
+ 		  darwin*)
+ 			AOT_SUPPORTED="yes"

debian/patches/series

@@ -0,0 +1 @@
+conditionally_define_alignas_for_precise.patch