[lldb] Update hardcoded Makefile.rules inclusions.

This replaces `include $(LEVEL)/Makefile.rules` with `include Makefile.rules`.
The lldb test driver already passes the include path when running make, and specifically looking for "../../Makefile.rules" forces the test to be in a specific location.
Removing this hardcoded relative path will make it possible to move this test as-is.

lldb/packages/Python/lldbsuite/test/functionalities/float-display/Makefile

@@ -1,3 +1,2 @@
-LEVEL = ../../make
 C_SOURCES := main.c
-include $(LEVEL)/Makefile.rules
+include Makefile.rules

lldb/packages/Python/lldbsuite/test/functionalities/param_entry_vals/basic_entry_values_x86_64/Makefile

@@ -1,5 +1,3 @@
-LEVEL = ../../../make
 CXX_SOURCES := main.cpp
-include $(LEVEL)/Makefile.rules
 CXXFLAGS_EXTRAS := -O2 -glldb -Xclang -femit-debug-entry-values
 include Makefile.rules

lldb/packages/Python/lldbsuite/test/lang/cpp/thread_local/Makefile

@@ -1,3 +1,2 @@
-LEVEL = ../../../make
 CXX_SOURCES := main.cpp
-include $(LEVEL)/Makefile.rules
+include Makefile.rules

lldb/packages/Python/lldbsuite/test/macosx/macabi/Makefile

@@ -1,5 +1,3 @@
-LEVEL = ../../make
-
 C_SOURCES := main.c
 LD_EXTRAS := -L. -lfoo
 
@@ -12,4 +10,4 @@ libfoo.dylib: foo.c
 	$(MAKE) -f $(MAKEFILE_RULES) \
 		DYLIB_ONLY=YES DYLIB_NAME=foo DYLIB_C_SOURCES=foo.c
 
-include $(LEVEL)/Makefile.rules
+include Makefile.rules