fftw3: Updated to the latest release

Removed obsolete patch file.
Removed BROKEN dependency for fftw3l variant as it builds well with musl.

Signed-off-by: Vladimir Ulrich <admin@evl.su>

libs/fftw3/Makefile

@@ -1,5 +1,5 @@
 #
-# Copyright (C) 2007-2017 OpenWrt.org
+# Copyright (C) 2007-2018 OpenWrt.org
 #
 # This is free software, licensed under the GNU General Public License v2.
 # See /LICENSE for more information.
@@ -8,13 +8,13 @@
 include $(TOPDIR)/rules.mk
 
 PKG_NAME:=fftw3
-PKG_VERSION:=3.3.7
+PKG_VERSION:=3.3.8
 PKG_RELEASE:=1
 PKG_LICENSE:=GPL-2.0+
 
 PKG_SOURCE:=fftw-$(PKG_VERSION).tar.gz
 PKG_SOURCE_URL:=http://www.fftw.org
-PKG_HASH:=3b609b7feba5230e8f6dd8d245ddbefac324c5a6ae4186947670d9ac2cd25573
+PKG_HASH:=6113262f6e92c5bd474f2875fa1b01054c4ad5040f6b0da7c03c98821d9ae303
 
 PKG_BUILD_DIR=$(BUILD_DIR)/$(PKG_NAME)-$(BUILD_VARIANT)/fftw-$(PKG_VERSION)
 PKG_FIXUP:=autoreconf
@@ -39,7 +39,6 @@ endef
 
 define Package/fftw3l
   $(call Package/fftw3)
-  DEPENDS:=@BROKEN
   VARIANT:=long-double
   TITLE+= (long-double precision)
 endef