Fixed configuration of zsh

sources/zsh/zsh.spec

@@ -1,13 +1,23 @@
 # Maintainer: Alexander Hill
 SRC_HASH="9b8d1ecedd5b5e81fbf1918e876752a7dd948e05c1a0dba10ab863842d45acd5"
 SRC_NAME="zsh"
+SRC_REVISION=1
 SRC_URL="https://www.zsh.org/pub/zsh-5.9.tar.xz"
 SRC_VERSION="5.9"
 
 build() {
     tar xf ../$SRC_FILENAME
     cd zsh-$SRC_VERSION/
-    ./configure $TT_AUTOCONF_COMMON --enable-multibyte --enable-libc-musl
+    # NOTE: Zsh uses a lot of tests made of main functions that are missing a
+    #       return type. Because of this, clang throws an error, causing the
+    #       test to fail. The result is a binary where command substitution
+    #       locks the shell up. To fix this, we pass -Wno-implicit-int to the
+    #       configure script. ~ahill
+    CFLAGS="$CFLAGS -Wno-implicit-int" \
+    ./configure \
+        $TT_AUTOCONF_COMMON \
+        --enable-multibyte \
+        --enable-libc-musl
     make -O -j $TT_PROCS
 }