Add  --with-jemalloc-prefix=je_ so it compiles on musl

Signed-off-by: Khem Raj <raj.khem@gmail.com>
Upstream-Status: Pending

--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -523,7 +523,7 @@ if(FLB_JEMALLOC AND ${CMAKE_SYSTEM_NAME}
   # Link to Jemalloc as an external dependency
   ExternalProject_Add(jemalloc
     SOURCE_DIR ${CMAKE_CURRENT_SOURCE_DIR}/lib/jemalloc-5.2.1
-    CONFIGURE_COMMAND ${CMAKE_CURRENT_SOURCE_DIR}/lib/jemalloc-5.2.1/configure ${AUTOCONF_HOST_OPT} --with-lg-quantum=3 --enable-cc-silence --prefix=<INSTALL_DIR>
+    CONFIGURE_COMMAND ${CMAKE_CURRENT_SOURCE_DIR}/lib/jemalloc-5.2.1/configure ${AUTOCONF_HOST_OPT} --with-jemalloc-prefix=je_ --with-lg-quantum=3 --enable-cc-silence --prefix=<INSTALL_DIR>
     CFLAGS=-std=gnu99\ -Wall\ -pipe\ -g3\ -O3\ -funroll-loops
     BUILD_COMMAND $(MAKE)
     INSTALL_DIR ${CMAKE_CURRENT_BINARY_DIR}/