Explicitly add gc include dir

Author: jeaye

compiler+runtime/CMakeLists.txt

@@ -269,6 +269,22 @@ add_library(
   src/cpp/jank/perf_native.cpp
 )
 
+set_property(TARGET jank_lib PROPERTY OUTPUT_NAME jank)
+
+target_compile_features(jank_lib PUBLIC ${jank_cxx_standard})
+target_compile_options(jank_lib PUBLIC ${jank_common_compiler_flags} ${jank_aot_compiler_flags})
+
+# We want all deps built as static libs.
+set(BUILD_SHARED_LIBS OFF)
+
+include(FetchContent)
+include(cmake/dependency/fmt.cmake)
+include(cmake/dependency/ftxui.cmake)
+include(cmake/dependency/libzippp.cmake)
+
+find_package(OpenSSL REQUIRED COMPONENTS Crypto)
+find_package(BDWgc REQUIRED)
+
 target_include_directories(
   jank_lib
   PUBLIC
@@ -278,6 +294,7 @@ target_include_directories(
   jank_lib
   SYSTEM
   PUBLIC
+  ${BDWGC_INCLUDE_DIR}
   "$<BUILD_INTERFACE:${PROJECT_SOURCE_DIR}/third-party/nanobench/include>"
   "$<BUILD_INTERFACE:${PROJECT_SOURCE_DIR}/third-party/folly>"
   "$<BUILD_INTERFACE:${PROJECT_SOURCE_DIR}/third-party/bpptree/include>"
@@ -290,22 +307,6 @@ target_include_directories(
   "$<BUILD_INTERFACE:${PROJECT_SOURCE_DIR}/third-party/boost-preprocessor/include>"
 )
 
-set_property(TARGET jank_lib PROPERTY OUTPUT_NAME jank)
-
-target_compile_features(jank_lib PUBLIC ${jank_cxx_standard})
-target_compile_options(jank_lib PUBLIC ${jank_common_compiler_flags} ${jank_aot_compiler_flags})
-
-# We want all deps built as static libs.
-set(BUILD_SHARED_LIBS OFF)
-
-include(FetchContent)
-include(cmake/dependency/fmt.cmake)
-include(cmake/dependency/ftxui.cmake)
-include(cmake/dependency/libzippp.cmake)
-
-find_package(OpenSSL REQUIRED COMPONENTS Crypto)
-find_package(BDWgc REQUIRED)
-
 target_link_libraries(
   jank_lib PRIVATE
   fmt::fmt