[lldb][test] Enable static linking with libcxx for import-std-module tests

--whole-archive and --allow-multiple-definition options has been added
to linker flags of these import-std-module tests in order to make them
pass with libcxx static linking enabled.

Darwin has been excluded since it doesn't seem to build in such
configuration.

Also, some tests were switched from system stdlib to libcxx since the
problem described in https://reviews.llvm.org/D139361 seems to be fixed.

Author: dzhidzhoev

lldb/test/API/commands/expression/import-std-module/array/Makefile

@@ -1,3 +1,8 @@
 USE_LIBCPP := 1
 CXX_SOURCES := main.cpp
+
+ifneq ($(OS),Darwin)
+	LD_EXTRAS := -Xlinker --whole-archive -Xlinker --allow-multiple-definition
+endif
+
 include Makefile.rules

lldb/test/API/commands/expression/import-std-module/deque-dbg-info-content/Makefile

@@ -1,3 +1,8 @@
 USE_LIBCPP := 1
 CXX_SOURCES := main.cpp
+
+ifneq ($(OS),Darwin)
+	LD_EXTRAS := -Xlinker --whole-archive -Xlinker --allow-multiple-definition
+endif
+
 include Makefile.rules

lldb/test/API/commands/expression/import-std-module/list-dbg-info-content/Makefile

@@ -1,3 +1,8 @@
 USE_LIBCPP := 1
 CXX_SOURCES := main.cpp
+
+ifneq ($(OS),Darwin)
+	LD_EXTRAS := -Xlinker --whole-archive -Xlinker --allow-multiple-definition
+endif
+
 include Makefile.rules

lldb/test/API/commands/expression/import-std-module/vector-dbg-info-content/Makefile

@@ -1,3 +1,8 @@
 USE_LIBCPP := 1
 CXX_SOURCES := main.cpp
+
+ifneq ($(OS),Darwin)
+	LD_EXTRAS := -Xlinker --whole-archive -Xlinker --allow-multiple-definition
+endif
+
 include Makefile.rules

lldb/test/API/commands/expression/import-std-module/vector-of-vectors/Makefile

@@ -1,3 +1,8 @@
 USE_LIBCPP := 1
 CXX_SOURCES := main.cpp
+
+ifneq ($(OS),Darwin)
+	LD_EXTRAS := -Xlinker --whole-archive -Xlinker --allow-multiple-definition
+endif
+
 include Makefile.rules