guile: needs strtol_l, not available for musl

Fixes:
http://autobuild.buildroot.net/results/861/861c3038dff03ded6d97b8bb61ba8754dc21c7f8/
http://autobuild.buildroot.net/results/cd3/cd3377585e4fa5c7457c50e827d96adeceaac04b/
http://autobuild.buildroot.net/results/b45/b453c419292dba39aaa309ea057e56662e9af2f6/

Musl doesn't implement strtol_l, which is used by guile.

Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/guile/Config.in

@@ -1,5 +1,6 @@
 config BR2_PACKAGE_GUILE
 	bool "guile"
+	depends on !BR2_TOOLCHAIN_USES_MUSL # no strtol_l
 	depends on BR2_TOOLCHAIN_HAS_THREADS
 	depends on BR2_PACKAGE_LIBATOMIC_ARCH_SUPPORTS # bdwgc
 	depends on BR2_USE_WCHAR # libunistring
@@ -15,7 +16,7 @@ config BR2_PACKAGE_GUILE
 
 	  http://www.gnu.org/software/guile
 
-comment "guile needs a toolchain w/ threads, wchar, dynamic library"
+comment "guile needs a uClibc or (e)glibc toolchain w/ threads, wchar, dynamic library"
 	depends on !BR2_TOOLCHAIN_HAS_THREADS || !BR2_USE_WCHAR || \
-		BR2_STATIC_LIBS
+		BR2_STATIC_LIBS || BR2_TOOLCHAIN_USES_MUSL