Make sure that _GNU_SOURCE is enabled in the linux configs that set
HAVE_POSIX_MEMALIGN. This eliminates a compiler warning. Also,
clean up some crufty linux-sparc* configs.
diff --git a/configs/linux-sparc5 b/configs/linux-sparc5
index b55fffc..e8848d2 100644
--- a/configs/linux-sparc5
+++ b/configs/linux-sparc5
@@ -1,17 +1,7 @@
# Configuration for Linux on Sparc5
-include $(TOP)/configs/default
+include $(TOP)/configs/linux-sparc
CONFIG_NAME = linux-sparc5
-# Compiler and flags
-CC = gcc
-CXX = g++
-CFLAGS = -mcpu=ultrasparc -O2 -ffast-math -ansi -pedantic -fPIC -D_SVID_SOURCE -D_BSD_SOURCE -I/usr/X11R6/include -DUSE_XSHM
-CXXFLAGS = -mcpu=ultrasparc -O2 -ffast-math -ansi -pedantic -fPIC -D_SVID_SOURCE -D_BSD_SOURCE
-GLUT_CFLAGS = -fexceptions
-
-GL_LIB_DEPS = -L/usr/X11R6/lib -lX11 -lXext -lm -lpthread
-GLUT_LIB_DEPS = -L$(TOP)/$(LIB_DIR) -l$(GLU_LIB) -l$(GL_LIB) -L/usr/X11R6/lib -lX11 -lXmu -lXt -lXi -lm
-GLW_LIB_DEPS = -L$(TOP)/$(LIB_DIR) -l$(GL_LIB) -L/usr/X11R6/lib -lXt -lX11
-
+ARCH_FLAGS += -mcpu=ultrasparc