Backed out changeset c30d8774c404: remove warning suppression

for possibly-uninitialized data member in BlockTimer::BlockTimer.

NickyD suggested a real fix.

indra/llrender/llimagegl.cpp

@@ -240,15 +240,6 @@ S32 LLImageGL::dataFormatComponents(S32 dataformat)
 
 //----------------------------------------------------------------------------
 
-#if LL_LINUX
-// gcc 4.7.2 produces this error for the following function, which nat has
-// been unable to diagnose as an actual problem:
-// llimagegl.cpp:247:2: error: '<anonymous>.LLTrace::BlockTimer::mStartTime'
-// may be used uninitialized in this function [-Werror=uninitialized]
-#pragma GCC diagnostic push
-#pragma GCC diagnostic ignored "-Wuninitialized"
-#endif
-
 static LLTrace::BlockTimerStatHandle FTM_IMAGE_UPDATE_STATS("Image Stats");
 // static
 void LLImageGL::updateStats(F32 current_time)
@@ -259,11 +250,6 @@ void LLImageGL::updateStats(F32 current_time)
 	sCurBoundTextureMemory = S32Bytes(0);
 }
 
-#if LL_LINUX
-// In general we do want to know about uninitialized variables!
-#pragma GCC diagnostic pop
-#endif
-
 //static
 S32 LLImageGL::updateBoundTexMem(const S32Bytes mem, const S32 ncomponents, S32 category)
 {