flex: fix build error due to undefined library symbols

Signed-off-by: Felix Fietkau <nbd@openwrt.org>

SVN-Revision: 39888

tools/Makefile

@@ -41,7 +41,7 @@ tools-$(BUILD_PPL_CLOOG) += ppl cloog
 
 # builddir dependencies
 $(curdir)/bison/compile := $(curdir)/flex/install
-$(curdir)/flex/compile := $(curdir)/m4/install
+$(curdir)/flex/compile := $(curdir)/automake/install
 $(curdir)/pkg-config/compile := $(curdir)/sed/install
 $(curdir)/libtool/compile := $(curdir)/sed/install
 $(curdir)/squashfs/compile := $(curdir)/lzma-old/install

tools/flex/patches/100-remove_no_undefined.patch

@@ -0,0 +1,18 @@
+--- a/Makefile.am
++++ b/Makefile.am
+@@ -73,13 +73,13 @@ libfl_la_SOURCES = \
+ 	libmain.c \
+ 	libyywrap.c
+ 
+-libfl_la_LDFLAGS = -no-undefined -version-info @SHARED_VERSION_INFO@
++libfl_la_LDFLAGS = -version-info @SHARED_VERSION_INFO@
+ 
+ libfl_pic_la_SOURCES = \
+ 	libmain.c \
+ 	libyywrap.c
+ 
+-libfl_pic_la_LDFLAGS = -no-undefined -version-info @SHARED_VERSION_INFO@
++libfl_pic_la_LDFLAGS = -version-info @SHARED_VERSION_INFO@
+ 
+ noinst_HEADERS = \
+ 	flexdef.h \