fftw: fix path to WISDOM_DIR

packages/fftw/build.sh

@@ -1,7 +1,7 @@
 TERMUX_PKG_HOMEPAGE=http://www.fftw.org/
 TERMUX_PKG_DESCRIPTION="Library for computing the Discrete Fourier Transform (DFT) in one or more dimensions"
 TERMUX_PKG_VERSION=3.3.6
-TERMUX_PKG_REVISION=2
+TERMUX_PKG_REVISION=3
 TERMUX_PKG_SRCURL=http://www.fftw.org/fftw-${TERMUX_PKG_VERSION}-pl1.tar.gz
 TERMUX_PKG_SHA256=1ef4aa8427d9785839bc767f3eb6a84fcb5e9a37c31ed77a04e7e047519a183d
 # ac_cv_func_clock_gettime=no avoids having clock_gettime(CLOCK_SGI_CYCLE, &t)

packages/fftw/fix-wisdom_dir.patch

@@ -0,0 +1,12 @@
+diff -uNr fftw-3.3.6-pl1/api/import-system-wisdom.c fftw-3.3.6-pl1.mod/api/import-system-wisdom.c
+--- fftw-3.3.6-pl1/api/import-system-wisdom.c	2017-01-15 14:03:24.000000000 +0200
++++ fftw-3.3.6-pl1.mod/api/import-system-wisdom.c	2017-09-12 11:20:08.432992283 +0300
+@@ -32,7 +32,7 @@
+ #if defined(__DJGPP__)
+ #  define WISDOM_DIR "/dev/env/DJDIR/etc/fftw/"
+ #else
+-#  define WISDOM_DIR "/etc/fftw/"
++#  define WISDOM_DIR "@TERMUX_PREFIX@/etc/fftw/"
+ #endif
+ 
+ int X(import_system_wisdom)(void)