Respect env build settings, dont force crappy flags, and make sure -rpath is added properly.

--- SConstruct
+++ SConstruct
@@ -81,16 +81,10 @@
 	if env['gcc_visibility']: 
 		env.Append(CCFLAGS=' -fvisibility-inlines-hidden -fvisibility=hidden ');
 		env.Append(CPPFLAGS=' -fvisibility-inlines-hidden -fvisibility=hidden ');
-	if debug:
-		env.Append(CCFLAGS='-ggdb ')
-		env.Append(CPPFLAGS='-ggdb ')
-	else: 
-		env.Append(CCFLAGS='-O3 ')
-		env.Append(CPPFLAGS='-O3 ')
 		
 	al_lib = 'openal'
-	env.Append(CPPFLAGS=' -Wall -pedantic -Wno-long-long -pipe -pthread ')
-	env.Append(CCFLAGS=' -Wall -pedantic -Wno-long-long -pipe -pthread ')
+	env.Append(CPPFLAGS=' -Wall -pedantic -Wno-long-long -pthread ')
+	env.Append(CCFLAGS=' -Wall -pedantic -Wno-long-long -pthread ')
 
 
 conf_env = env.Copy()
--- SConscript
+++ SConscript
@@ -94,7 +94,7 @@
 
 Import('lib_dir')
 if sys.platform != 'win32':
-	bt_env.Append(LINKFLAGS=' -Wl,-rpath '+ lib_dir + ' -Wl,-rpath-link,build/' + env['mode'] + '/mrt')
-	bt_env.Append(LINKFLAGS=' -Wl,-rpath '+ lib_dir + ' -Wl,-rpath-link,build/' + env['mode'] + '/sdlx')
+	bt_env.Append(LINKFLAGS=' -Wl,-rpath,'+ lib_dir + ' -Wl,-rpath-link,build/' + env['mode'] + '/mrt')
+	bt_env.Append(LINKFLAGS=' -Wl,-rpath,'+ lib_dir + ' -Wl,-rpath-link,build/' + env['mode'] + '/sdlx')
 
 bt_main = bt_env.Program('bt', bt_main_sources, LIBS=bt_main_libs, RPATH=[lib_dir])