gnu: aws-c-mqtt: Replace patch.

* gnu/packages/c.scm (aws-c-mqtt): Replace patch.
[arguments]: Fix CMAKE_PREFIX_PATH.
[source]: Remove patch.
* gnu/packages/patches/aws-c-mqtt-cmake-prefix.patch: Delete file.
* gnu/local.mk: Remove it.

Signed-off-by: Ludovic Courtès <ludo@gnu.org>

gnu/local.mk

@@ -872,7 +872,6 @@ dist_patch_DATA =						\
   %D%/packages/patches/awesome-reproducible-png.patch		\
   %D%/packages/patches/aws-c-auth-install-private-headers.patch	\
   %D%/packages/patches/aws-c-event-stream-cmake-prefix.patch  \
-  %D%/packages/patches/aws-c-mqtt-cmake-prefix.patch		\
   %D%/packages/patches/aws-checksums-cmake-prefix.patch		\
   %D%/packages/patches/aws-crt-cpp-cmake-prefix.patch		\
   %D%/packages/patches/aws-crt-cpp-disable-networking-tests.patch	\

gnu/packages/c.scm

@@ -846,6 +846,7 @@ (define-public aws-c-s3
 (define-public aws-c-mqtt
   (package
     (name "aws-c-mqtt")
+    ; Update only when updating aws-crt-cpp.
     (version "0.7.8")
     (source (origin
               (method git-fetch)
@@ -855,12 +856,13 @@ (define-public aws-c-mqtt
               (file-name (git-file-name name version))
               (sha256
                (base32
-                "19j6nw2v36c4yff4p0fbf0748s06fd5r9cp2yakry9ybn1ada99c"))
-              (patches (search-patches "aws-c-mqtt-cmake-prefix.patch"))))
+                "19j6nw2v36c4yff4p0fbf0748s06fd5r9cp2yakry9ybn1ada99c"))))
     (build-system cmake-build-system)
     (arguments
      '(#:configure-flags
-       '("-DBUILD_SHARED_LIBS=ON")))
+       (list "-DBUILD_SHARED_LIBS=ON"
+             (string-append "-DCMAKE_PREFIX_PATH="
+                            (assoc-ref %build-inputs "aws-c-common")))))
     (propagated-inputs
      `(("aws-c-http" ,aws-c-http)
        ("aws-c-io" ,aws-c-io)))

gnu/packages/patches/aws-c-mqtt-cmake-prefix.patch

@@ -1,13 +0,0 @@
---- a/CMakeLists.txt
-+++ b/CMakeLists.txt
-@@ -7,6 +7,10 @@ if (POLICY CMP0069)
-     cmake_policy(SET CMP0069 NEW) # Enable LTO/IPO if available in the compiler, see AwsCFlags
- endif()
- 
-+if (DEFINED ENV{CMAKE_PREFIX_PATH})
-+    set(CMAKE_PREFIX_PATH $ENV{CMAKE_PREFIX_PATH})
-+endif()
-+
- if (DEFINED CMAKE_PREFIX_PATH)
-     file(TO_CMAKE_PATH "${CMAKE_PREFIX_PATH}" CMAKE_PREFIX_PATH)
- endif()