Patch by Andreas Enge to force installation of libraries into lib
independently of the architecture, instead of lib32 or lib64.
On x86_64, the C library path coded in CMAKE_C_IMPLICIT_LINK_DIRECTORIES 
contains a library (jack) installed into lib64, which forces lib64
for avidemux with the original code.

diff -u -r avidemux_2.6.8.orig/cmake/admInstallDir.cmake avidemux_2.6.8/cmake/admInstallDir.cmake
--- avidemux_2.6.8.orig/cmake/admInstallDir.cmake	2014-03-12 07:15:23.000000000 +0100
+++ avidemux_2.6.8/cmake/admInstallDir.cmake	2015-07-26 14:31:10.418459984 +0200
@@ -16,13 +16,7 @@
                 MESSAGE(STATUS "No install dir provided, using /usr/local")
         ENDIF(NOT AVIDEMUX_INSTALL_DIR )
         SET(AVIDEMUX_BIN_DIR ${AVIDEMUX_INSTALL_DIR}/bin)
-        IF(CMAKE_C_IMPLICIT_LINK_DIRECTORIES MATCHES "\\/lib64([; ]|$)")
-                SET(AVIDEMUX_RELATIVE_LIB_DIR lib64)
-        ELSEIF(CMAKE_C_IMPLICIT_LINK_DIRECTORIES MATCHES "\\/lib32([; ]|$)")
-                SET(AVIDEMUX_RELATIVE_LIB_DIR lib32)
-        ELSE(CMAKE_C_IMPLICIT_LINK_DIRECTORIES MATCHES "\\/lib64([; ]|$)")
-                SET(AVIDEMUX_RELATIVE_LIB_DIR lib)
-        ENDIF(CMAKE_C_IMPLICIT_LINK_DIRECTORIES MATCHES "\\/lib64([; ]|$)")
+        SET(AVIDEMUX_RELATIVE_LIB_DIR lib)
         SET(AVIDEMUX_LIB_DIR ${AVIDEMUX_INSTALL_DIR}/${AVIDEMUX_RELATIVE_LIB_DIR})
 ENDIF(WIN32)
 SET(AVIDEMUX_INCLUDE_DIR ${AVIDEMUX_INSTALL_DIR}/include)
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<tr><td><span title='2021-05-05 16:56:44 +0200'>2021-05-05</span></td><td><a href='/guix/commit/gnu/packages/scheme.scm?id=3df04eb09f4a473cf6a214331cccba50694677f1'>gnu: racket: Move to (gnu packages racket).</a><span class='msg-avail'>...</span></td><td>Philip McGrath</td></tr>
<tr><td><span title='2021-04-29 14:57:15 +0200'>2021-04-29</span></td><td><a href='/guix/commit/gnu/packages/scheme.scm?id=041d62f7cc244d7f6c0bd6d60cdf08e72d400313'>gnu: bigloo: Update to 4.3g.</a><span class='msg-avail'>...</span></td><td>Guillaume Le Vaillant</td></tr>
<tr><td><span title='2021-04-12 18:42:22 +0200'>2021-04-12</span></td><td><a href='/guix/commit/gnu/packages/scheme.scm?id=834aa48504a24f0c79e858fc295edbf63815a408'>gnu: racket: Don't inject store paths into Racket files.</a><span class='msg-avail'>...</span></td><td>Philip McGrath</td></tr>
<tr><td><span title='2021-03-05 12:49:28 +0100'>2021-03-05</span></td><td><a href='/guix/commit/gnu/packages/scheme.scm?id=d2278beb103871ea469dcc55deafe7d687c75149'>gnu: racket: Update to 8.0.</a><span class='msg-avail'>...</span></td><td>Philip McGrath</td></tr>