cava: do not look into /usr/local/lib when searching for libraries at link time

Fix on-device build.

packages/cava/Makefile.am.patch

@@ -0,0 +1,12 @@
+diff -uNr cava-0.6.1/Makefile.am cava-0.6.1.mod/Makefile.am
+--- cava-0.6.1/Makefile.am	2018-05-03 19:07:33.000000000 +0300
++++ cava-0.6.1.mod/Makefile.am	2019-08-16 13:48:27.945938729 +0300
+@@ -11,7 +11,7 @@
+ bin_PROGRAMS = cava
+ cava_SOURCES = cava.c
+ cava_LDADD = -liniparser
+-cava_LDFLAGS = -L/usr/local/lib -Wl,-rpath /usr/local/lib
++cava_LDFLAGS =
+ cava_CPPFLAGS = -DPACKAGE=\"$(PACKAGE)\" -DVERSION=\"$(VERSION)\" \
+            -D_POSIX_SOURCE -D _POSIX_C_SOURCE=200809L
+ cava_CFLAGS = -std=c99 -Wall -Wextra -Wno-unused-result -Wno-maybe-uninitialized