Fix CPU architecture detection on BSDs.

CMake calls "uname" in order to detect the CPU architecture,
so $(CMAKE_SYSTEM_PROCESSOR) varies from platform to platform.

This changes adds support for "i386" and "amd64" values, which
are used by BSDs for the x86 family of CPUs.

Change-Id: I532ce787a9ac06220c92a6d8c78ad5a55d8c40bf
Signed-off-by: Piotr Sikora <piotr@cloudflare.com>
Reviewed-on: https://boringssl-review.googlesource.com/1360
Reviewed-by: Adam Langley <agl@google.com>

CMakeLists.txt

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 8645eaf..1e0ab07 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -12,6 +12,8 @@
 
 if (${CMAKE_SYSTEM_PROCESSOR} STREQUAL "x86_64")
 	set(ARCH "x86_64")
+elseif (${CMAKE_SYSTEM_PROCESSOR} STREQUAL "amd64")
+	set(ARCH "x86_64")
 elseif (${CMAKE_SYSTEM_PROCESSOR} STREQUAL "AMD64")
 	# cmake reports AMD64 on Windows, but we might be building for 32-bit.
 	if (CMAKE_CL_64)
@@ -21,6 +23,8 @@
 	endif()
 elseif (${CMAKE_SYSTEM_PROCESSOR} STREQUAL "x86")
 	set(ARCH "x86")
+elseif (${CMAKE_SYSTEM_PROCESSOR} STREQUAL "i386")
+	set(ARCH "x86")
 elseif (${CMAKE_SYSTEM_PROCESSOR} STREQUAL "arm")
 	set(ARCH "arm")
 else()