Fixes for aarch64 build (#474)

Author: artemdinaburg

README.md

@@ -170,7 +170,7 @@ Then you need to install 32-bit libstdc++ headers and libraries. On a Debian/Ubu
 ```sh
 sudo dpkg --add-architecture i386
 sudo apt-get update
-sudo apt-get install libc6-dev:i386 install libstdc++-10-dev:i386 g++-multilib
+sudo apt-get install libc6-dev:i386 libstdc++-10-dev:i386 g++-multilib
 ```
 
 This error happens because the SPARC32 runtime semantics (the bitcode library which lives in `<install directory>/share/remill/<version>/semantics/sparc32.bc`) are built as 32-bit code, but 32-bit development libraries are not installed by default.

tests/AArch64/CMakeLists.txt

@@ -12,12 +12,14 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-find_package(gtest REQUIRED)
-
-# google gtest
-find_package(gtest REQUIRED)
-list(APPEND PROJECT_LIBRARIES ${gtest_LIBRARIES})
-list(APPEND PROJECT_INCLUDEDIRECTORIES ${gtest_INCLUDE_DIRS})
+if (DEFINED ENV{TRAILOFBITS_LIBRARIES})
+  find_package(gtest REQUIRED)
+  list(APPEND PROJECT_LIBRARIES ${gtest_LIBRARIES})
+  list(APPEND PROJECT_INCLUDEDIRECTORIES ${gtest_INCLUDE_DIRS})
+else()
+  find_package(GTest CONFIG REQUIRED)
+  list(APPEND PROJECT_LIBRARIES GTest::gtest)
+endif()
 
 enable_testing()
 enable_language(ASM)