glx: Don't hard-code the name "libGL.so.1" in driOpenDriver (v3)

Add a macro GL_LIB_NAME to hold the filename that configure comes up with
based on the --with-gl-lib-name and --enable-mangling options.

In driOpenDriver, use the GL_LIB_NAME macro instead of hard-coding
"libGL.so.1".

v2: Add an #ifndef/#define for GL_LIB_NAME so that non-autoconf builds will
    work.
v3: Fix the library filename in the Makefile.

Signed-off-by: Kyle Brenneman <kbrenneman@nvidia.com>
Reviewed-by: Emil Velikov <emil.l.velikov@gmail.com>
Cc: "10.6 11.0" <mesa-stable@lists.freedesktop.org>
(cherry picked from commit d35391cfda)

src/glx/Makefile.am

@@ -46,6 +46,7 @@ AM_CFLAGS = \
 	$(EXTRA_DEFINES_XF86VIDMODE) \
 	-D_REENTRANT \
 	-DDEFAULT_DRIVER_DIR=\"$(DRI_DRIVER_SEARCH_DIR)\" \
+	-DGL_LIB_NAME=\"lib@GL_LIB@.so.1\" \
 	$(DEFINES) \
 	$(LIBDRM_CFLAGS) \
 	$(DRI2PROTO_CFLAGS) \

src/glx/dri_common.c

@@ -73,6 +73,10 @@ dri_message(int level, const char *f, ...)
    }
 }
 
+#ifndef GL_LIB_NAME
+#define GL_LIB_NAME "libGL.so.1"
+#endif
+
 #ifndef DEFAULT_DRIVER_DIR
 /* this is normally defined in Mesa/configs/default with DRI_DRIVER_SEARCH_PATH */
 #define DEFAULT_DRIVER_DIR "/usr/local/lib/dri"
@@ -99,7 +103,7 @@ driOpenDriver(const char *driverName)
    int len;
 
    /* Attempt to make sure libGL symbols will be visible to the driver */
-   glhandle = dlopen("libGL.so.1", RTLD_NOW | RTLD_GLOBAL);
+   glhandle = dlopen(GL_LIB_NAME, RTLD_NOW | RTLD_GLOBAL);
 
    libPaths = NULL;
    if (geteuid() == getuid()) {