build: force .so extension for the gallium dri modules

While linux uses .so as a default extension for shared libraries that is
not the case for other platforms. The loader in libGL (and others) assumes
that the dri module will always have a .so extension, thus it will fail
to load on the affected platforms.

Spotted-by: Jon TURNEY <jon.turney@dronecode.org.uk>
Signed-off-by: Emil Velikov <emil.l.velikov@gmail.com>

install-gallium-links.mk

@@ -12,7 +12,7 @@ all-local : .libs/install-gallium-links
 		link_dir=$(top_builddir)/$(LIB_DIR)/egl;	\
 	fi;							\
 	$(MKDIR_P) $$link_dir;					\
-	file_list=$(dri_LTLIBRARIES:%.la=.libs/%.$(LIB_EXT)*);	\
+	file_list=$(dri_LTLIBRARIES:%.la=.libs/%.so);		\
 	file_list+=$(vdpau_LTLIBRARIES:%.la=.libs/%.$(LIB_EXT)*); \
 	file_list+=$(egl_LTLIBRARIES:%.la=.libs/%.$(LIB_EXT)*);	\
 	file_list+=$(lib_LTLIBRARIES:%.la=.libs/%.$(LIB_EXT)*);	\

src/gallium/Automake.inc

@@ -55,6 +55,7 @@ DRI_VERSION_SCRIPT ?= $(top_srcdir)/src/gallium/state_trackers/dri/dri.link
 
 GALLIUM_DRI_LINKER_FLAGS = \
 	-shared \
+	-shrext .so \
 	-module \
 	-avoid-version \
 	$(GC_SECTIONS) \