package/libsquish: re-enable for BR2_STATIC_LIBS configuration

Since the bump to version 1.15, libsquish can conditionally
build/install its shared library, which makes it possible to re-enable
this package for BR2_STATIC_LIBS configurations.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

package/libsquish/Config.in

@@ -1,7 +1,6 @@
 config BR2_PACKAGE_LIBSQUISH
 	bool "libsquish"
 	depends on BR2_INSTALL_LIBSTDCPP
-	depends on !BR2_STATIC_LIBS
 	help
 	  The libSquish library compresses images with the DXT standard
 	  (also known as S3TC). This standard is mainly used by OpenGL
@@ -9,5 +8,5 @@ config BR2_PACKAGE_LIBSQUISH
 
 	  http://sourceforge.net/projects/libsquish
 
-comment "libsquish needs a toolchain w/ C++, dynamic library"
-	depends on !BR2_INSTALL_LIBSTDCPP || BR2_STATIC_LIBS
+comment "libsquish needs a toolchain w/ C++"
+	depends on !BR2_INSTALL_LIBSTDCPP

package/libsquish/libsquish.mk

@@ -12,7 +12,11 @@ LIBSQUISH_STRIP_COMPONENTS = 0
 LIBSQUISH_LICENSE = MIT
 LIBSQUISH_LICENSE_FILES = LICENSE.txt
 
+ifeq ($(BR2_STATIC_LIBS),y)
+LIBSQUISH_MAKE_ENV = USE_SHARED=0
+else
 LIBSQUISH_MAKE_ENV = USE_SHARED=1
+endif
 
 define LIBSQUISH_BUILD_CMDS
 	$(TARGET_CONFIGURE_OPTS) $(LIBSQUISH_MAKE_ENV) $(MAKE) -C $(@D)