libjasper: fix linking with libm for on-device builds

packages/libjasper/CMakeLists.txt.patch

@@ -0,0 +1,12 @@
+diff -uNr jasper-version-2.0.16/CMakeLists.txt jasper-version-2.0.16.mod/CMakeLists.txt
+--- jasper-version-2.0.16/CMakeLists.txt	2019-03-12 20:04:35.000000000 +0200
++++ jasper-version-2.0.16.mod/CMakeLists.txt	2019-08-16 21:46:51.751881755 +0300
+@@ -323,7 +323,7 @@
+ 
+ find_library(MATH_LIBRARY m)
+ if (NOT MATH_LIBRARY)
+-	set(MATH_LIBRARY "")
++	set(MATH_LIBRARY "-lm")
+ endif()
+ 
+ ################################################################################

packages/libjasper/build.sh

@@ -12,6 +12,3 @@ TERMUX_PKG_EXTRA_CONFIGURE_ARGS="
 -H$TERMUX_PKG_SRCDIR
 -B$TERMUX_PKG_BUILDDIR
 "
-termux_step_pre_configure() {
-	LDFLAGS+=" -lm"
-}