xava: fix ftbfs for cross build

srcpkgs/xava/patches/broken-cmake.patch

@@ -0,0 +1,22 @@
+--- CMakeLists.txt.orig	2020-08-27 15:31:42.000000000 +0700
++++ CMakeLists.txt	2021-01-14 21:44:51.704505119 +0700
+@@ -10,19 +10,6 @@
+ option(SNDIO "SNDIO" ON)
+ option(PORTAUDIO "PORTAUDIO" ON)
+ 
+-# Fix pkg-config for cross-builds (such as MinGW on ArchLinux)
+-if(CMAKE_FIND_ROOT_PATH)
+-    set(CMAKE_SYSROOT "${CMAKE_FIND_ROOT_PATH}")
+-
+-    set(ENV{PKG_CONFIG_DIR} "")
+-    set(ENV{PKG_CONFIG_LIBDIR} "${CMAKE_SYSROOT}/lib/pkgconfig:${CMAKE_SYSROOT}/share/pkgconfig")
+-    set(ENV{PKG_CONFIG_SYSROOT_DIR} ${CMAKE_SYSROOT})
+-endif()
+-
+-if(NOT CMAKE_BUILD_TYPE)
+-	set(CMAKE_BUILD_TYPE Debug)
+-endif()
+-
+ set(CMAKE_C_STANDARD 11)
+ set(xava_VERSION_MAJOR 0)
+ set(xava_VERSION_MINOR 6)